In computed tomography (CT) cross-sectional images of the attenuation distribution within a slice are created by scanning radiographic projections of an object with a rotating X-ray source detector compound and subsequent reconstruction of the images from these projection data on a computer. CT can be made very fast by employing a scanned electron beam instead of a mechanically moving X-ray source. Now this principle was extended towards high-energy electron beam tomography with an electrostatic accelerator. Therefore a dedicated experimental campaign was planned and carried out at the Budker Insitute of Nuclear Physics (BINP), Novosibirsk. There we investigated the capabilities of BINP’s accelerators as an electron beam generating and scanning unit of a potential high-energy electron beam tomography device. The setup based on a 1 MeV ELV-6 (BINP) electron accelerator and a single detector. Besides tomographic measurements with different phantoms, further experiments were carried out concerning the focal spot size and repeat accuracy of the electron beam as well as the detector’s response time and signal to noise ratio.

In computed tomography (CT) cross-sectional images of the attenuation distribution within a slice are created by scanning radiographic projections of an object with a rotating X-ray source detector compound and subsequent reconstruction of the images from these projection data on a computer. CT can be made very fast by employing a scanned electron beam instead of a mechanically moving X-ray source. Now this principle was extended towards high-energy electron beam tomography with an electrostatic accelerator. Therefore a dedicated experimental campaign was planned and carried out at the Budker Insitute of Nuclear Physics (BINP), Novosibirsk. There we investigated the capabilities of BINP’s accelerators as an electron beam generating and scanning unit of a potential high-energy electron beam tomography device. The setup based on a 1 MeV ELV-6 (BINP) electron accelerator and a single detector. Besides tomographic measurements with different phantoms, further experiments were carried out concerning the focal spot size and repeat accuracy of the electron beam as well as the detector’s response time and signal to noise ratio.

Die Quantifizierung koronararterieller Verkalkungen mit der Elektronenstrahltomographie hat sich als ein genaues nichtinvasives Instrument der Risikostratefizierung bei koronarer Herzerkrankung erwiesen. Obwohl die Herztransplantation heute als etablierte Therapie der fortgeschrittenen Herzinsuffizienz akzeptiert ist, wird der langfristige Behandlungserfolg durch das Auftreten einer koronararteriellen Intimaproliferation, der sog. Graftsklerose, limitiert. Um die Eignung der Elektronenstrahltomographie für die Diagnostik der Graftsklerose zu prüfen, wurden 112 Patienten zwischen einem und 153 (Median: 46) Monate nach Herztransplantation untersucht. Die koronararterielle Kalklast wurde mit der Agatston-Methode quantifiziert und mit den Ergebnissen der Koronarangiographie und der intrakoronaren Ultraschalluntersuchung verglichen. Koronararterielle Verkalkungen fanden sich bei 84 Patienten (75%). In der Koronarangiographie wiesen 16 Patienten eine >50% Stenose auf, deren Agatston-Score nur in einem Fall unter 55 lag (p9 das Vorliegen verkalkter Plaques. Die Elektronenstrahltomographie hat sich damit als ein vielversprechendes Verfahren zur nichtinvasiven Diagnose einer koronaren Herzerkrankung nach Herztransplantation erwiesen. / Electron beam computed tomography (EBCT) is a non-invasive imaging method that allows for the accurate estimation of coronary risk. Although cardiac transplantation represents the ultimate treatment of end stage congestive heart failure, ist success is limited by intimal proliferation, also known as transplant vasculopathy. To validate the use of EBCT in the detection of cardiac transplant coronary disease, 112 patients were examined between one and 153 months after cardiac transplantation (median: 46 months). Coronary artery calcium load was determined by the Agatston-method and compared with the results of conventional coronary angiography and intracoronary ultrasound. Coronary artery calcifications were found in 84 patients (75%). Upon coronary angiography, 16 patients displayed stenotic lesions of more than 50% of the luminal diameter, and only one of these patients had an Agaston score of less than 55 (p