PMID: 15239426Jul 9, 2004Paper

Dose reduction in computed tomography by individualized scan protocols

Acta Radiologica
L JanglandJ Persliden

Abstract

To find a method of adjusting the mAs-value in relation to the size of the patient undergoing computed tomography (CT) examination as a means of minimizing the radiation dose to the patient. A correction factor to be applied on the tube charge for each patient was calculated using two mathematical methods. This approach was tested on 4 Perspex phantoms of different sizes and geometries. Noise was measured in the images with and without use of the correction factors. Retrospectively, correction factors were calculated for 12 CT examinations of the abdomen and the dose reduction was estimated for these patient studies. The variations in noise measured in the images of the different phantoms were dramatically reduced by both methods. The retrospectively performed patient study showed that the largest correction factor was 7 times greater than the smallest, which means that a dose reduction factor of 7 is possible in the extreme case. Our proposed methods of adjusting the applied tube charge (mAs-value) in relation to the size of the patient can be used on the vast majority of CT systems. The potential for dose reduction is great, especially for small patients.

Citations

Oct 14, 2006·The British Journal of Radiology·A J Van der MolenJ Geleijns
Jan 24, 2008·AJR. American Journal of Roentgenology·Takeshi KuboHiroto Hatabu
Mar 29, 2006·European Radiology·E M Coppenrath, U G Mueller-Lisse
Aug 31, 2019·Journal of Applied Clinical Medical Physics·Mohammad RawashdehMark F McEntee

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