Imaging dose in variable pitch body perfusion CT scans: An analysis using TG111 formalism

Abstract

Upon successful implementation of TG111 formalism, standard imaging dose was measured for a body CTp protocol using the variable pitch helical acquisition. The TG111 formalism is not directly applicable to this type of acquisition. Measurement of dose for all variable pitch protocols is strongly suggested.

Pilot study of combined FDG‐PET and dynamic contrast‐enhanced CT of locally advanced cervical carcinoma before and during concurrent chemoradiotherapy suggests association between changes in tumor blood volume and treatment response

“…It is less costly than DCE‐MRI, more accessible as it can be performed on modern CT and PET/CT simulators, and robustly quantifiable because of the linear relationship between contrast concentration and signal enhancement. These advantages come at the expense of additional radiation dose which we have previously confirmed to be about 5 mGy/100 mAs for the imaging protocol used here 27. For a typical body DCE‐CT the cumulative imaging dose will range from 20 to 30 cGy, which is less than a percent of the total therapeutic dose.…”

Avaliação de sistemas de controle automático de exposição em tomografia computadorizada

“…The cone beam CT and a high advanced detection set made possible to use wider collimation to image a wider area at once and shorten the scan time, which improved especially the cardiac CT imaging [37,38] . The new metrics of CT dosimetry has been developed and the American Association of Physicists in Medicine (AAPM) published the Report 111 [39,40] with a guide for this new measurement paradigm for wider collimation and helical scans [41] . Other new recommendations were introduced by the Institute of Physics and Engineering in Medicine (IPEM) [42] in United Kingdom.…”