Radiation Dose Reduction of Head CT scan with a Low–Tube Voltage

Abstract

The increasing radiation exposure to patient from CT has been of concern to radiologists, medical physicists. The aim of this study is to reduce radiation dose from head computed tomography (CT) by using a technique with low tube voltage (90 Kv) instead of (120 Kv). A phantom for measurement of the radiation dose and a phantom containing low-contrast objects were scanned with a 16–detector row CT scanner at 120 kV and 90 kV. The tube current–time product settings were 100–560 mAs, and the doses at the center and periphery of the phantom were measured.The effective dose and the DLP were estimated for patients who are undertaking head for CT examinations- By using phantom. From these results it is found that the longer scan series imparts a higher DLP to the patient compared to that of a shorter scan series. A reduction from 120 kV to 90 kV led to as much as a 35% reduction in the radiation dose, without of low-contrast detectability, at CT.