Prospects for the reduction of the patient doses based on the optimization of the CT abdomen protocols for the different types of malignancies

Abstract

Reducing radiation exposure in computed tomography is a relevant medical task due to the growing number of studies and the lack of generally accepted approaches to their conduct in the radiological community. One way to reduce the effective dose in contrast-enhanced computed tomography of the abdomen is to optimize the protocol of examination, which can include four scans: in the native, arterial, venous and delayed phases. However while providing repeated studies in patients with oncological diseases, it is possible to confine one or two phases, which will allow the radiologist to visualize observed pathological changes and to evaluate the response to the treatment, as well as detect the recurrence in case of the monitoring of the patients. In the present study, two groups were formed on the basis of a sample of 514 patients. In group 1 (control), CTB was performed according to a three- or four-phase protocol. In group 2, the same patients with an interval from 1 to 5.5 months were performed with computed tomography -OBP according to a single or two-phase protocol depending on the degree of vascularization of the tumor tissue and the clinical situation. At the same time, a decrease in the average effective dose in patients in group 2 compared with group 1 was demonstrated by 63% (p<0.05). In all cases, the various pathological changes that characterize the oncological process and were diagnosed with a three- or four-phase protocol were visualized with a single- or two-phase protocol. Thus, the informative value of computed tomography examination did not decrease.