Question

Explain the principle of spiral Multi-slice Computerized Tomography (MSCT) emphasizing the mathematics involved. In particular, discus the use of interpolation involved upon data on one tilted-plane on each side of the horizontal plane of concern. In MSCT (Multi-Slice Helical CT), how is the radiologist's pitch defined and what is its upper limit/bound?

Answer 1

a. Computed tomography requires measurement, at different angles, of the dose profile of the fan shaped x-ray beam after attenuation by the patient. To achieve this a quickly rotating gantry containing an x-ray tube and detector array are used.

b.  The pitch in multislice spiral CT is defined as the ratio of the table increment over the detector collimation in this study.