TRANSVERSE TOMOSYNTHESIS ON A DIGITAL SIMULATOR

The availability of digital radiographic imaging on simulators has led to the investigation of a number of new imaging possibilities, includ ing digital linear tomography (tomosynthesis). It has been shown that a single set of projections in this case is sufficient to reconstruct images from multiple planes, including planes tilted with respect to t he tube motion. The present work examines the feasibility of tomosynth etic image reconstruction in transverse planes using a CCD-based digit al radiotherapy simulator with conventional isocentric rotational geom etry. General transformation equations were derived to permit image re construction in arbitrary transverse planes. Transverse images of the skull section of the humanoid phantom have been generated using a 360 degrees gantry sweep. Bone, air, and radiographic markers are well res olved, but the image quality is poor due to the suboptimal scanning ge ometry available on the simulator. (C) 1997 American Association of Ph ysicists in Medicine.