Myokardscintigrafi är en nuklearmedicinsk metod som används för att kartlägga och visuellt bedöma blodflödet till hjärtat. Vid undersökningen används radiofarmakan Myoview, som består av radionukliden 99mTechnetium som vid sönderfall avger gammastrålning som kan registreras med en gammakamera. StarGuide är en modern gammakamera som implenterades i verksamheten på Skånes universitetssjukhus år 2022. Skillnaden mellan konventionella kamerasystem och StarGuide är främst utformningen och uppbyggnaden av detektorerna, vilket även påverkar hur bilderna framställs. Det här gör att det inte finns några riktlinjer på kliniken gällande kvalitetssäkring i myokardscintigrafi-bilder tagna med StarGuide. Syftet med studien var att undersöka om det finns korrelation mellan counts och kroppsvikt i myokardscintigrafibilder tagna med StarGuide. Retrospektiva data från totalt 60 patienter användes till studien. Medelcounts/s/MBq sattes mot vikt i en scatterplot samt utfördes även en korrelationsanalys. Korrelationsanalysen för hela populationen gav ett värde på -0,790. Könsfördelade korrelationsanalyser utfördes även och gav värdena -0,784 för kvinnor och -0,706 för män. Slutsatsen är att det finns en märkbar korrelation mellan counts och vikt tagna på StarGuide men att det behövs vidare arbete för att stärka studiens fynd. Framför allt behövs insamling av mer data från patienter med en lägre vikt då de var underrepresenterade i studien. / Myocardial perfusion SPECT is a nuclear test used to map and visually assess blood flow to the heart. In the test, the radiopharmaceutical Myoview is used, which consists of the radionuclide 99mTechnetium, which when decaying emits gamma radiation that can be registered with a gamma camera. StarGuide is a modern gamma camera that was implemented in the clinics at Skåne University Hospital in 2022. The difference between conventional camera systems and StarGuide is primarily the design and construction of the detectors, which also affects how the images are produced. This means that there are no guidelines in the clinic regarding quality assurance in myocardial scintigraphy images taken with StarGuide. The purpose of the study was to investigate whether there is a correlation between counts and body weight in myocardial scintigraphy images taken with StarGuide. Retrospective data from a total of 60 patients were used for the study. Mean counts/s/MBq were plotted against weight in a scatter plot and a correlation analysis was also performed. The correlation analysis for the whole population gave a rsvalue of -0.790. Gender-distributed correlation analyzes were also performed and yielded rsvalues ​​of -0.784 for women and -0.706 for men. The conclusion is that there is a noticeable correlation between counts and weight taken on the StarGuide, but that further work is needed to strengthen the study's findings. Above all, the collection of more data is needed from patients with a lower weight as they were underrepresented in the study.

Previous studies have shown that the formulation of an active pharmaceutical ingredient (API) entrapped in the Pheroid® (Pheroid for simplification) delivery system enhances absorption of the API, suppresses its metabolism, and may contribute to an increase in the quantity of the API present at the site of action. Higher drug levels at the active site should particularly increase the effectiveness of a drug with a narrow therapeutic index and reduce the incidence of the resistance that may otherwise arise if the sub-therapeutic levels of the API are in contact with the site of interest. Two approaches were followed in this study. First, the radioactive tracer molecule 99mTechnetium methylene diphosphonate (99mTc MDP) was used. Intravenously injected 99mTc MDP is an extremely effective bone-seeking radiopharmaceutical used in the diagnosis of bone disorders such as bone metastases in patients. However, if entrapped inside a Pheroid vesicle, it will locate to that site, usually an organ, where the Pheroid vesicles may tend to accumulate. Experiments conducted with 99mTc MDP alone or with Pheroid will therefore establish how efficiently Pheroid vesicles localize and will also indicate the preferred site of localization inside a body. The process would involve the oral administration of 99mTc MDP either alone or with Pheroid, involving an animal model. It would also involve tracking localization to particular organs, blood or other sites. The second approach requires the use of chloroquine (CQ) labeled with carbon-14 (14C-CQ,) to compare absorption of the drug both with and without the Pheroid system. The intention was to compare oral absorption and bio-distribution of 14C-CQ administered either alone or entrapped in the Pheroid system. It was also possible to establish whether the Pheroid affects the biological half-lives of the CQ and residence times of CQ in the different organs of the body. Absorption of free 99mTc MDP (orally adminsistered) through the intestinal tract is negligible but it was anticipated that increased absorption will be observed when 99mTc MDP was entrapped in the Pheroid system. In the 99mTc MDP study, different routes of administration of 99mTc MDP, as well as 99mTc MDP entrapped and not entrapped in the Pheroid system, were investigated. The Sprague Dawley rat was used as animal model. Rats were divided into three groups of four rats each for the first part of the study. In the first group, only 99mTc MDP was injected intravenously in order to establish natural distribution of the 99mTc MDP. For the second group, 99mTc MDP was administered orally in order to establish whether there was any absorption through the intestinal tract. In the third group, the 99mTc MDP was entrapped in Pheroid vesicles and this formulation was administered orally in order to establish whether the Pheroid system enhanced oral absorption. The animals were sacrificed four hours after administration and organs were harvested and were counted for radioactivity to determine the percentage of injected/administrated dose in each organ. After oral administration, the Pheroid system was found to have facilitated absorption of 99mTc MDP through the intestinal tract into the blood. 99mTc MDP concentrations in the femur, although lower, were still comparable with that observed after intravenous administration of 99mTc MDP in the absence of Pheroid. Thus, overall, excellent absorption of the Pheroid entrapped 99mTc MDP through the intestinal tract was seen in contrast to little or zero absorption of the compound in the reference formulations. The half-life of the radio-labelled compound in the blood was prolonged after oral administration owing to the Pheroid. To investigate the bio-distribution of radioactive chloroquine (14C-CQ) Sprague Dawley rats were divided into two groups of four rats each. In the first group, 14C-CQ in deionised (DI) water was administered orally, and in the second group 14C-CQ entrapped in Pheroid vesicles was administered, also orally. The animals were sacrificed one, two and four hours after administration and subjected to comprehensive macroscopic inspection. All the organs were harvested and radioactivity was determined with liquid scintillation after applicable sample preparation. The Pheroid system produced much higher organ and blood concentrations of 14C-CQ and enhanced residence times within the organs and blood in comparison with that of 14C-CQ administered alone. Commercial applications of these results are possible, as a number of radiopharmaceutical products can presently be administered only intravenously. The added potential of these new Pheroid formulations could be of significance in the treatment of malaria, as chloroquine is inexpensive and widely available. Another point of interest is that the use of these formulations may enable micromolar drug concentrations to be achieved using drug dosage regimes that usually produce only nanomolar levels. However, safety aspects would have to be carefully monitored. / PhD (Pharmaceutics), North-West University, Potchefstroom Campus, 2015

Previous studies have shown that the formulation of an active pharmaceutical ingredient (API) entrapped in the Pheroid® (Pheroid for simplification) delivery system enhances absorption of the API, suppresses its metabolism, and may contribute to an increase in the quantity of the API present at the site of action. Higher drug levels at the active site should particularly increase the effectiveness of a drug with a narrow therapeutic index and reduce the incidence of the resistance that may otherwise arise if the sub-therapeutic levels of the API are in contact with the site of interest. Two approaches were followed in this study. First, the radioactive tracer molecule 99mTechnetium methylene diphosphonate (99mTc MDP) was used. Intravenously injected 99mTc MDP is an extremely effective bone-seeking radiopharmaceutical used in the diagnosis of bone disorders such as bone metastases in patients. However, if entrapped inside a Pheroid vesicle, it will locate to that site, usually an organ, where the Pheroid vesicles may tend to accumulate. Experiments conducted with 99mTc MDP alone or with Pheroid will therefore establish how efficiently Pheroid vesicles localize and will also indicate the preferred site of localization inside a body. The process would involve the oral administration of 99mTc MDP either alone or with Pheroid, involving an animal model. It would also involve tracking localization to particular organs, blood or other sites. The second approach requires the use of chloroquine (CQ) labeled with carbon-14 (14C-CQ,) to compare absorption of the drug both with and without the Pheroid system. The intention was to compare oral absorption and bio-distribution of 14C-CQ administered either alone or entrapped in the Pheroid system. It was also possible to establish whether the Pheroid affects the biological half-lives of the CQ and residence times of CQ in the different organs of the body. Absorption of free 99mTc MDP (orally adminsistered) through the intestinal tract is negligible but it was anticipated that increased absorption will be observed when 99mTc MDP was entrapped in the Pheroid system. In the 99mTc MDP study, different routes of administration of 99mTc MDP, as well as 99mTc MDP entrapped and not entrapped in the Pheroid system, were investigated. The Sprague Dawley rat was used as animal model. Rats were divided into three groups of four rats each for the first part of the study. In the first group, only 99mTc MDP was injected intravenously in order to establish natural distribution of the 99mTc MDP. For the second group, 99mTc MDP was administered orally in order to establish whether there was any absorption through the intestinal tract. In the third group, the 99mTc MDP was entrapped in Pheroid vesicles and this formulation was administered orally in order to establish whether the Pheroid system enhanced oral absorption. The animals were sacrificed four hours after administration and organs were harvested and were counted for radioactivity to determine the percentage of injected/administrated dose in each organ. After oral administration, the Pheroid system was found to have facilitated absorption of 99mTc MDP through the intestinal tract into the blood. 99mTc MDP concentrations in the femur, although lower, were still comparable with that observed after intravenous administration of 99mTc MDP in the absence of Pheroid. Thus, overall, excellent absorption of the Pheroid entrapped 99mTc MDP through the intestinal tract was seen in contrast to little or zero absorption of the compound in the reference formulations. The half-life of the radio-labelled compound in the blood was prolonged after oral administration owing to the Pheroid. To investigate the bio-distribution of radioactive chloroquine (14C-CQ) Sprague Dawley rats were divided into two groups of four rats each. In the first group, 14C-CQ in deionised (DI) water was administered orally, and in the second group 14C-CQ entrapped in Pheroid vesicles was administered, also orally. The animals were sacrificed one, two and four hours after administration and subjected to comprehensive macroscopic inspection. All the organs were harvested and radioactivity was determined with liquid scintillation after applicable sample preparation. The Pheroid system produced much higher organ and blood concentrations of 14C-CQ and enhanced residence times within the organs and blood in comparison with that of 14C-CQ administered alone. Commercial applications of these results are possible, as a number of radiopharmaceutical products can presently be administered only intravenously. The added potential of these new Pheroid formulations could be of significance in the treatment of malaria, as chloroquine is inexpensive and widely available. Another point of interest is that the use of these formulations may enable micromolar drug concentrations to be achieved using drug dosage regimes that usually produce only nanomolar levels. However, safety aspects would have to be carefully monitored. / PhD (Pharmaceutics), North-West University, Potchefstroom Campus, 2015

Objetivos: Avaliar a eficácia da injeção intraoperatória para identificação do linfonodo sentinela (LS) em câncer de mama com o uso do Dextran 500-99m-Tecnécio (Tc) e azul patente. Analisar se as doses do radiofármaco, o IMC (índice de massa corporal) e o volume da mama influenciam no tempo para migração ao LS. Metodologia: Estudo prospectivo, realizado entre abril de 2008 e junho de 2009, que incluiu 74 biópsias de LS em pacientes com câncer de mama em estádios T1N0 e T2N0. Injetou-se, após indução anestésica, de 0,5 a 1,5 mCi de Dextran 500-99m-Tc filtrado 0,22 μm na região subareolar num volume de 5 ml e 2 ml de azul patente. Resultados: Identificou-se o LS em 100% dos casos. Um LS (1,35%) estava marcado apenas com o azul patente. A taxa de identificação com o “probe” foi de 98% (73/74 casos). A dose média de radiofármaco aplicada foi 0,97 mCi + 0,22. O tempo médio para marcação do LS foi de 10,7 minutos (+ 5,7min). Identificamos em média 1,66 LS com o radioisótopo. A dose aplicada não apresentou relação com o tempo para captação (p=0,73). Quanto maior o volume da mama e IMC, maior o tempo para captação na região axilar (Pearson Correlation r=0,393 p<0,01; r=0,469 p<0,01 - respectivamente). Conclusão: A injeção intraoperatória do radiofármaco é eficaz para identificação do LS em câncer de mama. O tempo para marcação do LS é maior em pacientes com IMC elevado e mamas volumosas. Doses maiores de radiofármaco não diminuem o tempo de migração. / Objectives: To determine the identification of sentinel lymph node (SLN) in breast cancer after intraoperative injection of Dextran 500‐99mTechnetium (Tc) and blue dye. To analyze if the doses of the radioisotope, body mass index (BMI) and breast volume influence the migration time of the SLN. Methodology: Prospective study between april 2008 and june 2009, which included 74 biopsies of SLN in patients with breast cancer in stages T1N0 and T2N0. Intraoperative injection after induction of general anesthesia, 0.5 to 1.5 mCi of dextran 500‐99m‐Tc filtered 0.22 μm in the subareolar region in a volume of 5 ml and 2 ml of blue dye. Results: We identified the SLN in 100% of cases. In one case (1.35%) the SLN was marked only with the blue dye. The SLN identification rate with the probe was 98% (73/74 cases). The mean dose of radioisotope injected was 0.97 + 0.22 mCi. The average time to mark the SLN was 10.7 minutes (+ 5.7 min). We identified an average 1.66 SLN with the radioisotope. The dose had no effect on the time to capture (p = 0.73). The larger breast volume and BMI, the greater the capture time in the axillary region (Pearson Correlation r=0.393 p <0.01, r=0.469 p <0.01 - respectively). Conclusion: Intraoperative injection of the radioisotope is effective for the identification the SLN in breast cancer. Time to mark the SLN is higher in patients with high BMI and large breasts. Higher doses of radioisotope do not decrease the migration time.

Objetivos: Avaliar a eficácia da injeção intraoperatória para identificação do linfonodo sentinela (LS) em câncer de mama com o uso do Dextran 500-99m-Tecnécio (Tc) e azul patente. Analisar se as doses do radiofármaco, o IMC (índice de massa corporal) e o volume da mama influenciam no tempo para migração ao LS. Metodologia: Estudo prospectivo, realizado entre abril de 2008 e junho de 2009, que incluiu 74 biópsias de LS em pacientes com câncer de mama em estádios T1N0 e T2N0. Injetou-se, após indução anestésica, de 0,5 a 1,5 mCi de Dextran 500-99m-Tc filtrado 0,22 μm na região subareolar num volume de 5 ml e 2 ml de azul patente. Resultados: Identificou-se o LS em 100% dos casos. Um LS (1,35%) estava marcado apenas com o azul patente. A taxa de identificação com o “probe” foi de 98% (73/74 casos). A dose média de radiofármaco aplicada foi 0,97 mCi + 0,22. O tempo médio para marcação do LS foi de 10,7 minutos (+ 5,7min). Identificamos em média 1,66 LS com o radioisótopo. A dose aplicada não apresentou relação com o tempo para captação (p=0,73). Quanto maior o volume da mama e IMC, maior o tempo para captação na região axilar (Pearson Correlation r=0,393 p<0,01; r=0,469 p<0,01 - respectivamente). Conclusão: A injeção intraoperatória do radiofármaco é eficaz para identificação do LS em câncer de mama. O tempo para marcação do LS é maior em pacientes com IMC elevado e mamas volumosas. Doses maiores de radiofármaco não diminuem o tempo de migração. / Objectives: To determine the identification of sentinel lymph node (SLN) in breast cancer after intraoperative injection of Dextran 500‐99mTechnetium (Tc) and blue dye. To analyze if the doses of the radioisotope, body mass index (BMI) and breast volume influence the migration time of the SLN. Methodology: Prospective study between april 2008 and june 2009, which included 74 biopsies of SLN in patients with breast cancer in stages T1N0 and T2N0. Intraoperative injection after induction of general anesthesia, 0.5 to 1.5 mCi of dextran 500‐99m‐Tc filtered 0.22 μm in the subareolar region in a volume of 5 ml and 2 ml of blue dye. Results: We identified the SLN in 100% of cases. In one case (1.35%) the SLN was marked only with the blue dye. The SLN identification rate with the probe was 98% (73/74 cases). The mean dose of radioisotope injected was 0.97 + 0.22 mCi. The average time to mark the SLN was 10.7 minutes (+ 5.7 min). We identified an average 1.66 SLN with the radioisotope. The dose had no effect on the time to capture (p = 0.73). The larger breast volume and BMI, the greater the capture time in the axillary region (Pearson Correlation r=0.393 p <0.01, r=0.469 p <0.01 - respectively). Conclusion: Intraoperative injection of the radioisotope is effective for the identification the SLN in breast cancer. Time to mark the SLN is higher in patients with high BMI and large breasts. Higher doses of radioisotope do not decrease the migration time.

Objetivos: Avaliar a eficácia da injeção intraoperatória para identificação do linfonodo sentinela (LS) em câncer de mama com o uso do Dextran 500-99m-Tecnécio (Tc) e azul patente. Analisar se as doses do radiofármaco, o IMC (índice de massa corporal) e o volume da mama influenciam no tempo para migração ao LS. Metodologia: Estudo prospectivo, realizado entre abril de 2008 e junho de 2009, que incluiu 74 biópsias de LS em pacientes com câncer de mama em estádios T1N0 e T2N0. Injetou-se, após indução anestésica, de 0,5 a 1,5 mCi de Dextran 500-99m-Tc filtrado 0,22 μm na região subareolar num volume de 5 ml e 2 ml de azul patente. Resultados: Identificou-se o LS em 100% dos casos. Um LS (1,35%) estava marcado apenas com o azul patente. A taxa de identificação com o “probe” foi de 98% (73/74 casos). A dose média de radiofármaco aplicada foi 0,97 mCi + 0,22. O tempo médio para marcação do LS foi de 10,7 minutos (+ 5,7min). Identificamos em média 1,66 LS com o radioisótopo. A dose aplicada não apresentou relação com o tempo para captação (p=0,73). Quanto maior o volume da mama e IMC, maior o tempo para captação na região axilar (Pearson Correlation r=0,393 p<0,01; r=0,469 p<0,01 - respectivamente). Conclusão: A injeção intraoperatória do radiofármaco é eficaz para identificação do LS em câncer de mama. O tempo para marcação do LS é maior em pacientes com IMC elevado e mamas volumosas. Doses maiores de radiofármaco não diminuem o tempo de migração. / Objectives: To determine the identification of sentinel lymph node (SLN) in breast cancer after intraoperative injection of Dextran 500‐99mTechnetium (Tc) and blue dye. To analyze if the doses of the radioisotope, body mass index (BMI) and breast volume influence the migration time of the SLN. Methodology: Prospective study between april 2008 and june 2009, which included 74 biopsies of SLN in patients with breast cancer in stages T1N0 and T2N0. Intraoperative injection after induction of general anesthesia, 0.5 to 1.5 mCi of dextran 500‐99m‐Tc filtered 0.22 μm in the subareolar region in a volume of 5 ml and 2 ml of blue dye. Results: We identified the SLN in 100% of cases. In one case (1.35%) the SLN was marked only with the blue dye. The SLN identification rate with the probe was 98% (73/74 cases). The mean dose of radioisotope injected was 0.97 + 0.22 mCi. The average time to mark the SLN was 10.7 minutes (+ 5.7 min). We identified an average 1.66 SLN with the radioisotope. The dose had no effect on the time to capture (p = 0.73). The larger breast volume and BMI, the greater the capture time in the axillary region (Pearson Correlation r=0.393 p <0.01, r=0.469 p <0.01 - respectively). Conclusion: Intraoperative injection of the radioisotope is effective for the identification the SLN in breast cancer. Time to mark the SLN is higher in patients with high BMI and large breasts. Higher doses of radioisotope do not decrease the migration time.

A papaína, enzima proteolítica extraída do fruto da Carica papaya Linnaeus, apresenta grande perspectiva para carreamento de fármacos devido propriedade anti-inflamatória, antitumoral e aumento da permeação. O presente trabalho teve como objetivo estudar as variáveis de processo da síntese radio-induzida, com o propósito de avaliar a influência destes parâmetros na formação da nanopartícula além do seu potencial como nanocarreador. A síntese foi realizada na presença (20%, v/v) e ausência de etanol, tampão fosfato e radiação gama (10 kGy) para reticulação e esterilização simultânea. As amostras foram avaliadas através da técnica de espalhamento dinâmico de luz, para verificar diâmetro hidrodinâmico, UV e fluorescência para verificação do conteúdo proteico e estrutura secundária, respectivamente. A atividade enzimática foi avaliada utilizando o substrato N-alfa-benzoil-DL-arginina-4-nitroanilida (BAPA). Parâmetros como concentração proteica, molaridade do tampão, pH, tempo e temperatura de solvatação e taxa de dose foram estudados. Posteriormente, foi realizado estudo da estabilidade por 180 dias e demonstração da capacidade de radiomarcação utilizando o tecnécio-99m, além da natureza da reticulação e esterilização das amostras. Conclui-se que a síntese otimizada das nanopartículas de papaína ocorre a 10 mg.mL-1 utilizando tampão fosfato 50 mM com (pH 7) à 0°C, tempo de solvatação de 1 a 6 horas e taxa de dose de 5 kGy.h-1. Ao usar essas condições, a formação de nanopartículas ocorrerá de maneira mais efetiva e com atividade proteolítica preservada. A reticulação das nanopapaínas, nas condicões descritas acima, ocorrem majoritariamente por natureza intramolecular e apresenta esterilidade na dose estabelecida de 10 kGy. As amostras se mostraram estáveis por até 30 dias quando mantidas sob 0°C. A radiomarcação com 99mTc por via direta obteve eficiência de 90% e demonstrou o grande potencial da nanopartícula como nanocarreador. / Papain, proteolytic enzyme extracted from the fruit of Carica papaya Linnaeus, presents great prospect for drug delivery due to the anti-inflammatory and antitumor proprieties and increased permeation. The present work aims to study variable process conditions of radio-induced synthesis, with the purpose of evaluating the influence of the parameters on the nanoparticle formation and potential for radiopharmaceutical loading. The synthesis was performed in the presence (20%, v/v) and absence of ethanol, phosphate buffer and ionizing radiation at 10 kGy, using 60Co as a radioactive source to promote crosslinking and simultaneous sterilization. The samples were evaluated by dynamic light scattering to verify hydrodynamic diameter, UV and fluorescence for verification of protein content and secondary structure, respectively. The enzymatic activity was evaluated using N-alpha-benzoyl-DL-arginine-4-nitroanilide (BAPA) as specific substrate. Parameters such as protein concentration, buffer molarity, pH, time and temperature of solvation and dose rate were studied in order to evaluate the changes and the effect of each condition on the formation of the nanoparticle. Subsequently, a study of the stability of the samples for 180 days and the efficiency of the radiolabeling with technetium-99m were carried out. Additionally, the nature of protein crosslinking and the sterilization was studied. It was concluded that the optimized synthesis of papain nanoparticles occurs at 10 mg.mL-1 using 50 mM phosphate buffer (pH 6-7) at 0°C, solvation time of 1 to 6 hours and dose rate of 5 kGy.h-1. By using these conditions, the formation of nanoparticles will occur more rapidly, with preserved proteolytic activity and considerable levels of cross-linking. Papain crosslinking are intramolecular and 10 kGy demonstrate sterilized potential. Samples were stable for 20-30 days when kept at 20°C and 0-4°C, respectively. Radiolabeling with technetium by direct route obtained efficiency of 90% and demonstrated great potential as a nanocarrier.

Made available in DSpace on 2014-12-17T14:13:21Z (GMT). No. of bitstreams: 1 PatriciaFM_tese.pdf: 303057 bytes, checksum: d3d1e5a21de3ce58bcfe65ef800c8734 (MD5) Previous issue date: 2008-05-13 / The uses of radiobiocomplexes labeled with technetium-99m contributed to health science advances. Stannous chloride (SnCl2) has been used as a reducing agent for the labeling process. Cytotoxic and genotoxic effect of the SnCl2 have been described in several studies and with this experimental models alterations in molecular and cellular level can be evaluated. In the last years the physicals therapists acquired new devices which emits electromagnetic radiation such us Extremely Low Frequency Pulsated Electromagnetic Fields (E.L.F. P.E.M.F.), radiofrequency, Intense Pulsed Light (I.P.L.) and others which emits sonic waves such us Biorresonance. Scientific evidence of the effects and dosage is important to protect public health and to reach exposition levels that result in significant biological effects. The aim of this project is to verify the effects of these physical agents in plasmid DNA and E. coli AB1157 cultures in presence or absence of SnCl2 and the effects in blood constituents labeled with technetium-99m. Wistar rats blood was exposed to the cited sources and the labelling of blood constituents with 99mTc was carried through. Cultures of E. coli AB1157 and plasmidial samples DNA had been also exposed the physical agents. The results suggest that these agents are capable of altering neither the survival of E. coli cells or plasmid DNA electrophoresis mobility. The multidiscipline character was clearly in this study due the interaction between Nuclear Medicine department of the UERJ and the Laboratory of Physical Agents of the Maimonides University in Argentina until the union between the teacher (biomedical and physiotherapist) and student (physiotherapist), besides collaborators of the area of Physics and Biology, promoting new ideas and perspectives and also adding the knowledge of different areas and origins / O uso de radiobiocomplexos marcados com 99mtecn?cio tem contribu?do para avan?os em Ci?ncias da Sa?de. Na marca??o desses radiobiocomplexos utiliza-se o redutor cloreto estanoso (SnCl2). Efeitos citot?xicos e genot?xicos do SnCl2 t?m sido descritos. Atrav?s de modelos experimentais em n?vel molecular, celular e sist?mico estas altera??es podem ser avaliadas. Entre os novos agentes f?sicos sugeridos para a pr?tica da Fisioterapia Dermato-Funcional, h? os que s?o de natureza eletromagn?tica (campos eletromagn?ticos pulsados, a radiofreq??ncia e a luz intensa pulsada) e os de natureza mec?nica (ondas s?nicas). A literatura a respeito dos agentes f?sicos gera d?vidas quanto aos seus efeitos. Seu uso correto ? importante n?o s? para proteger a sa?de p?blica, mas tamb?m para justificar n?veis de exposi??o que resultem em efeitos biol?gicos significativos. Dessa forma, o objetivo desse estudo ? verificar os poss?veis efeitos destes agentes f?sicos em plasm?dios bacterianos e em culturas bacterianas na presen?a e na aus?ncia de cloreto estanoso e na marca??o de elementos sang??neos com o 99mtecn?cio. Sangue de ratos Wistar foi exposto ?s fontes citadas e a marca??o de c?lulas sangu?neas com 99mtecn?cio foi realizada. Culturas de E. coli AB1157 e amostras DNA plasmidial tamb?m foram expostas aos agentes f?sicos. As consequ?ncias biol?gicas associadas a esses agentes n?o foram capazes de interferir em algumas propriedades dos constituintes sangu?neos, nem na sobreviv?ncia de E. coli ou na mobilidade eletrofor?tica do DNA plasmidial. O car?ter multidisciplinar ficou claro neste estudo desde a intera??o entre o Setor de Medicina Nuclear da UERJ e o Laborat?rio de Agentes F?sicos da Universidade Maimonides na Argentina at? a uni?o entre um orientador (biom?dico e fisioterapeuta) e uma orientanda (fisioterapeuta), contando com colaboradores da ?rea de F?sica e Biologia, possibilitando novas id?ias e perspectivas, agregando o conhecimento de diferentes ?reas

99mTecknetium-tetrofosmin är ett radiofarmaceutiskt medel som används vid myokardscintigrafi för att bedöma myokardperfusionen genom att avbilda vänsterkammarens blodflöde. Radiofarmakat uppvisar ett lågt myokardiellt upptag på endast 1,2%, där majoriteten av resterande radiofarmaka rensas ut genom levern och utsöndras via gallsystemet. Det extrakardiella upptaget i buken kan minska bildkvalitén, dölja defekter och försämra diagnostisk noggrannhet. GE StarGuide är en SPECT/CT-kamera utrustad med avancerad detektorteknologi som möjliggör fokuserad fotoninsamling, vilket bidrar till högre bildupplösning. Syftet med den här studien var att undersöka effekten av bukupptag vid bedömning av vänsterkammarens blodfördelning vid myokardscintigrafi med hjälp av SPECT/CT-kameran StarGuide. För att uppnå detta användes en thoraxmodell med ett fantomhjärta och en slang som simulerade bukupptag. Slangen fylldes med varierande aktivitetskoncentrationer och avståndet mellan slangen och fantomhjärtat varierades systematiskt. Vårdpersonal inom området bedömde sedan om bildomtagning var nödvändig, baserat på bildkvalitén och effekten av bukupptaget. Resultatet från studien indikerar en kvalitativ och kvantitativ påverkan av bukupptag vid bedömning av blodfördelningen i vänsterkammaren för de olika undersökta aktivitetskoncentrationerna och avstånden. Däremot observerades ingen statistisk signifikant skillnad mellan aktivitetskoncentrationerna vad gäller den kvantitativt påverkan. Vidare studier krävs för att validera dessa fynd och ge nya riktlinjer för att optimera användningen av StarGuide inom den nuklearmedicinska verksamheten. / 99mTechnetium-tetrofosmin is a radiopharmaceutical agent used for myocardial perfusion scintigraphy to assess myocardial perfusion by imaging the left ventricular bloodflow. The agent exhibits a low myocardial uptake of only 1,2%, with the majority of the agent being cleared through the liver and excreted via the biliary system. The extracardiac uptake in the abdomen can reduce image quality, conceal defects, and compromise diagnostic accuracy. The GE StarGuide is a SPECT/CT-camera equipped with advanced detector technology that allows for focused photon collection, thus contributing to improved image resolution. The objective of the present phantomstudy was to investigate the effect of abdominal uptake on the assessment of blood distribution in the left ventricle during myocardial perfusion scintigraphy using the SPECT/CT-camera StarGuide. To acieve this, a thorax model containing a phantomheart was used, with a tube simulating abdominal uptake. The tube was filled with varying activity concentrations, and the distance between the tube and the phantomheart was systematically varied. Healthcare professionals within the field then assessed whether image retakes were necessary based on the image quality and the impact of the abdominal uptake. The results of the study indicated that there is a qualitative and quantitative effect of extracardiac uptake on the assessment of left ventricular blood distribution for the different activity concentrations and distances examined, however, no statistically significant difference was observed between the activity concentrations quantitatively. Further investigations are needed to validate these findings and provide guidance for optimizing the use of the StarGuide camera in nuclear medicine practice.