الفهرس 
Physical Principles of Multi-Detector Row CTOnly 14 pages are availabe for public view
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Abstract
Peripheral arterial disease (PAD) is an important health problem with a high prevalence in the industrialized world, Conventional digital subtraction angiography (DSA) has been considered the gold-standard technique in the assessment of PAD.
Digital subtraction angiography (DSA), the standard of reference in the evaluation of lower extremity arterial disease, is an invasive procedure with substantial costs and a risk of complications. For this reason, non-invasive techniques such as magnetic resonance (MR) angiography and computed tomographic (CT) angiography are increasingly used in the assessment of lower extremity arterial disease.
Over the years, results of several studies have been published that validate contrast material–enhanced CT angiography as a non-invasive alternative to conventional DSA for imaging the vascular tree.
Further advances in CT angiography technology resulted in an increased number of detector rows, enabling thinner collimation, faster scan speed, and improved tube capacity, which could improve the diagnostic performance of this modality.
The applications of MDCT in imaging the lower extremities include the evaluation of peripheral arterial occlusive and aneurysmal disease, and arterial injury owing to trauma.
The main advantages of this novel technology are the fast scan times, high spatial resolution, increased anatomic coverage, and capability to generate high-quality multiplanar reformations and three-dimensional (3-D) renderings from raw data that can be reprocessed easily and quickly.
The advantages of multidetector CT angiography over MR angiography are the relatively short imaging time and lower cost. MR angiography is contraindicated in patients with metal implants. Other limitations of MR angiography include slow flow that mimics stenosis and limitations in spatial resolution.
Disadvantages of multidetector CT angiography include the use of radiation and the presence of severe calcifications that may cause overestimation of stenosis, especially in patient with diabetes.