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In vivo characterization of ultrasonic backscattering from normal and abnormal lungsJafari, Farhad. January 1900 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1983. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 261-265).
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Ultrasound elastography : method and clinical application /Bae, Unmin. January 2007 (has links)
Thesis (Ph. D.)--University of Washington, 2007. / Vita. Includes bibliographical references (leaves 66-71).
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Use of three-dimensional ultrasound in the prediction of homozygous alpha0-thalassemiaYeung, Tin-wai., 楊天慧. January 2008 (has links)
published_or_final_version / Obstetrics and Gynaecology / Master / Master of Philosophy
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Design of an aperture-domain imaging method and signal acquisition hardware for ultrasound-based vector flow estimationTsang, Kwok-hon. January 2009 (has links)
Thesis (M. Phil.)--University of Hong Kong, 2010. / Includes bibliographical references (p. 67-[70]). Also available in print.
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Prenatal ultrasound prediction of homozygous α⁰-thalassemiaLeung, Kwok-yin., 梁國賢. January 2012 (has links)
Homozygous α0-thalassemia is a serious autosomal recessive disorder with
poor fetal outcome and severe maternal complications. Conventionally, prenatal
diagnosis is performed by an invasive test. A non-invasive approach using serial
ultrasonography can effectively reduce the need for invasive tests in unaffected
pregnancies.
For two-dimensional ultrasound prediction, a total of 777 at-risk fetuses were
studied from 12 to 20 weeks between 1995 and 2006. At 12–15 weeks’ gestation, the
highest sensitivity (98.3%) was achieved by the combination of fetal cardiothoracic
ratio (CTR) and/or middle cerebral artery peak systolic velocity (MCA-PSV) at a
false-positive rate of 15.8%. At 16–20 weeks’ gestation, the sensitivity of CTR was
100.0%, but the false-positive rate was 5.2%. In contrast, the false-positive rate of
MCA-PSV alone was 1.4% and that of the combination of CTR and MCA-PSV was
0%, although their sensitivities were less than 65%.
In a cross-sectional retrospective study of 546 samples at-risk and control (268
fetal and 278 neonatal cord blood), the degree of anemia was only mild in 27.5% of
the affected fetuses (see chapter 3 for definition of mild anemia). Because MCA-PSV
is not very predictive of mild anemia, this may be one of the reasons why MCA-PSV
is not very sensitive in predicting an affected pregnancy.
A total of 832 at-risk pregnancies were studied using same noninvasive approach
at Maternal and Neonatal Hospital of Guangzhou (MNH) and Tsan Yuk Hospital
(TYH). The overall sensitivity and specificity of the noninvasive approach was 100%
and 95.6% respectively. At MNH, the need for an invasive test was reduced by 78.6%,
and all the affected pregnancies were diagnosed before 24 weeks’ gestation. After
adequate training and monitoring the quality of the subsequent ultrasound
examinations, the results achieved at MNH were comparable to TYH, with at-risk
pregnancies including the affected ones being seen at a more advanced gestation at
MNH.
In a retrospective review of 361 women at risk of carrying an affected fetus, 311
(86.2%) opted for the non-invasive approach using CTR and/or placenta. The cost
saving of this non-invasive approach was relatively small (HK$ 2,651) in comparison
to the cost of the whole prenatal screening program. On the other hand, the
non-invasive approach was more expensive than the direct invasive approach for low
MCV couples, as well as couples discordant for α-thalassemia and β-thalassemia.
ages. These results support the adoption of non-invasive approach in which routine
invasive test or karyotyping is no longer performed.
A total of 106 at-risk pregnancies and normal controls were prospectively studied
using three-dimensional ultrasonography. Placental volume (PV) at 11-14 weeks, and
PV/CRL quotient at 9-14 weeks’ gestation of affected pregnancies were significantly
greater than unaffected pregnancies (P<0.05). Using a cut-off point of 1.2ml/mm for
PV/CRL quotient to predict an affected pregnancy, the sensitivity, and specificity was
96.2%, and 100.0% respectively. / published_or_final_version / Obstetrics and Gynaecology / Master / Doctor of Medicine
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Deconvolution of three-dimensional medical ultrasoundGomersall, William Henry January 2011 (has links)
No description available.
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Diagnostic ultrasound imaging and its role within musculoskeletal medicine a dissertation submitted in partial fulfilment for the degree of Master of Health Science, Auckland University of Technology, March 2003.Jeffery, Roland. January 2003 (has links) (PDF)
Dissertation (MHSc--Health Science) -- Auckland University of Technology, 2003. / Also held in print (137 leaves ; 30 cm.) in North Shore Campus Theses Collection (T 616.07543 JEF)
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Ultrasound phased array simulations for hyperthermiaZeng, Xiaozheng. January 2008 (has links)
Thesis (PH. D.)--Michigan State University. Electrical Engineering, 2008. / Title from PDF t.p. (viewed on Sept. 8, 2009) Includes bibliographical references (p. 155-162). Also issued in print.
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Unique determination of acoustic properties from thermoacoustic data /Hickmann, Kyle Scott. January 1900 (has links)
Thesis (Ph. D.)--Oregon State University, 2011. / Printout. Includes bibliographical references (leaves 182-187). Also available on the World Wide Web.
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Fabrication, characterization and modeling of K₃₁ piezoelectric micromachined ultrasonic transducers (pMUTs)Choi, Hongsoo, January 2007 (has links) (PDF)
Thesis (Ph. D.)--Washington State University, December 2007. / Includes bibliographical references (p. 138-148).
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