The evaluation of low dose X-ray CT in breast

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  • ファントムを用いた低線量乳腺CT撮影に関する検討
  • ファントム オ モチイタ テイセンリョウ ニュウセン CT サツエイ ニ カンスル ケントウ

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Abstract

Advantages of breast X-ray CT include a relatively short examination time, wide availability and high resolution images compared with MR imaging and safely perfomed in patients with contraindications to MR imaging such as a cardiac pacemaker or claustrophobia. On the other hand, an important disadvantage includes exposure dose. Focusing on the reduction of exposure dose that is the problem of X-ray CT, we performed a phantom study by changing the X-ray dose from 150 to 45mAs (150, 100, 75, 50, 40 mAs). After scanning, evaluated a visual assessment and contrast-to-noise ratio (CNR) of Maximum intensity Projection (MIP) and multi-planar reconstruction (MPR) images. The effect of noise increases as the dose decreases, but an equivalent detectability was achieved even when the X-ray dose was decreased to 50% of 150mAs. Further consideration on other scan conditions (e.g. pitch factor and X-ray tube voltage) and other reconstruction kernel to suppress image noise will enable acquisition of high-quality image as well as reduction of exposure dose even in the X-ray CT.

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