{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,23]],"date-time":"2026-04-23T09:25:57Z","timestamp":1776936357478,"version":"3.51.4"},"reference-count":28,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2009,3,10]],"date-time":"2009-03-10T00:00:00Z","timestamp":1236643200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Medical Physics"],"published-print":{"date-parts":[[2009,4]]},"abstract":"The purpose of this work was to evaluate potential advantages and limitations of CZT detectors used in surface\u2010on, edge\u2010on, and tilted angle irradiation geometries. Simulations and experimental investigations of the energy spectrum measured by a CZT detector have been performed using different irradiation geometries of the CZT. Experiments were performed using a CZT detector with size and thickness. The detector was irradiated with collimated photon beams from Am\u2010241 and Co\u201057 . The edge\u2010scan method was used to measure the detector response function in edge\u2010on illumination mode. The tilted angle mode was investigated with the radiation beam directed to the detector surface at angles of 90\u00b0, 15\u00b0, and 10\u00b0. The Hecht formalism was used to simulate theoretical energy spectra. The parameters used for simulations were matched to experiment to compare experimental and theoretical results. The tilted angle CZT detector suppressed the tailing of the spectrum and provided an increase in peak\u2010to\u2010total ratio from 38% at 90\u00b0 to 83% at 10\u00b0 tilt angle for radiation. The corresponding increase for radiation was from 60% at 90\u00b0 to 85% at 10\u00b0 tilt angle. The edge\u2010on CZT detector provided high energy resolution when the beam thickness was much smaller than the thickness of CZT. The FWHM resolution in edge\u2010on illumination mode was 4.2% for beam with thickness, and rapidly deteriorated when the thickness of the beam was increased. The energy resolution of surface\u2010on geometry suffered from strong tailing effect at photon energies higher than . It is concluded that tilted angle CZT provides high energy resolution but it is limited to a 1D linear array configuration. The surface\u2010on CZT provides 2D pixel arrays but suffers from tailing effect and charge build up. The edge\u2010on CZT is considered suboptimal as it requires small beam thickness and also suffers from charge buildup.<\/jats:p>","DOI":"10.1118\/1.3085876","type":"journal-article","created":{"date-parts":[[2009,3,31]],"date-time":"2009-03-31T07:55:42Z","timestamp":1238486142000},"page":"1098-1108","source":"Crossref","is-referenced-by-count":12,"title":["CZT detectors used in different irradiation geometries: Simulations and experimental results"],"prefix":"10.1002","volume":"36","author":[{"given":"Shannon G.","family":"Fritz","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Polad M.","family":"Shikhaliev","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2009,3,10]]},"reference":[{"key":"e_1_2_6_2_1","first-page":"933","volume-title":"The Essential Physics of Medical Imaging","author":"Bushberg J. 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