A variable resolution x-ray detector for computed tomography: II. Imaging theory and performance.
A computed tomography (CT) imaging technique called variable resolution x-ray (VRX) detection provides variable image resolution ranging from that of clinical body scanning (1 cy/mm) to that of microscopy (100 cy/mm). In this paper, an experimental VRX CT scanner based on a rotating subject table and an angulated storage phosphor screen detector is described and tested. The measured projection resolution of the scanner is > or = 20 lp/mm. Using this scanner, 4.8-s CT scans are made of specimens of human extremities and of in vivo hamsters. In addition, the system's projected spatial resolution is calculated to exceed 100 cy/mm for a future on-line CT scanner incorporating smaller focal spots (0.1 mm) than those currently used and a 1008-channel VRX detector with 0.6-mm cell spacing.
DiBianca
F A
FA
School of Biomedical Engineering, University of Tennessee, Memphis 38163, USA.
Zou
P
P
Jordan
L M
LM
Laughter
J S
JS
Zeman
H D
HD
Sebes
J
J
D000465:Algorithms; D000818:Animals; D001132:Arm / Q000000981:diagnostic imaging; D006224:Cricetinae; D004867:Equipment Design; D005385:Fingers / Q000000981:diagnostic imaging; D006257:Head / Q000000981:diagnostic imaging; D006801:Humans; D015233:Models, Statistical; D013902:Radiography, Thoracic; D014057:Tomography, X-Ray Computed / Q000295:instrumentation* / Q000379:methods*; D014961:X-Ray Diffraction