Reducing CT angiography radiation dose, not image quality

Analysis by L. Williams

 

Introduction

For patients with suspected peripheral vascular occlusive disease, digital subtraction angiography (DSA) allows real-time diagnosis but the procedure is considered invasive and time-consuming, and is associated with a risk of complications such as bruising and pain, and a 4–6 hour recovery period.
Computed tomography (CT) angiography offers a noninvasive alternative to DSA, with an image acquisition time of seconds and no prolonged recovery period. However, the radiation dose associated with CT is significant and has been linked to a potential risk for cancer, and efforts to reduce the radiation dose have resulted in increased imaging noise.

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