Lower Extremity CT Angiography Research Articles

Image Quality and Radiation Dose of Lower Extremity CT Angiography in 128 Slice Dual-Source CT: Comparison of High Pitch and Low Pitch

Image Quality and Radiation Dose of Lower Extremity CT Angiography in 128 Slice Dual-Source CT: Comparison of High Pitch and Low Pitch

Objective preoperative estimation of the ability of primary closure on anterolateral thigh free flap donor site: Circumference and area ratios of deep tissue to thigh

The purpose of this study was to consider the relationship between the ratio of deep tissue including muscle to thigh at donor sites and the possibility of performing primary closure of donor site. The subjects were 74 patients who had harvesting of anterolateral thigh (ALT) free flap from June 2005 to June 2011. Primary closure was possible for 65 but not possible for 9. All received CT angiography of lower extremity before their operations. We measured circumference and cross-sectional area of thigh and deep tissue including muscle at the reference point. Using the measured data, we examined the ratio of circumference as well as cross-sectional area of deep tissue including muscles to thighs. For whom primary closure was possible, the ratio of deep tissue including muscle's circumference to thigh's at the reference point was 0.83 ± 0.07 on average, and the ratio of cross-sectional area was 0.68 ± 0.11. For whom primary closure was not possible, the ratio of circumference was 0.89 ± 0.06 on average, and the cross-section areas was 0.8 ± 0.07. The average width of flap for those with primary closure was 64.9 mm and without primary closure was 84.4 mm. There was statistical significance in ratios of circumference and cross-sectional area between primary closure and without primary closure. Primary closure of donor site when performing ALT free flap gets increasingly difficult as the ratio of deep tissue including muscle in the thighs increased. Such information prior to the procedure will be helpful in determining flap design and finalizing the operation plan.

Multidetector-row CT Angiography of Lower Extremities: Usefulness in the Diagnosis of and Intervention for Peripheral Arterial Disease

CT angiography (CTA) based on the data acquired by multidetector-row CT (MDCT) is an established, minimally invasive modality for imaging peripheral arteries. CTA has been used to assess peripheral arterial disease before treatment, and it has replaced conventional angiography for the diagnostic evaluation of peripheral arteries. MDCT can optimize both the long scan length and spatial resolution. CTA using MDCT depicts the fine structures of vessels. Recently, automated CTA analysis software has been developed for measurement of the vascular lumen. The software can automatically measure the diameters of short axial sections at the post-processing workstation. Measurement of the vascular lumen is useful in the planning of intravascular treatment for peripheral arterial disease. CTA is also utilized in assessing the intravascular lumen after metallic stent placement.

Abstract No. 315 EE: A Simplified Universal Technique for Multidetector CT Angiography of Lower Extremities Based on Fixed Scan Time

Abstract No. 315 EE: A Simplified Universal Technique for Multidetector CT Angiography of Lower Extremities Based on Fixed Scan Time

Atherosclerotic Peripheral Vascular Disease Symposium II

Peripheral vascular diseases are important components of cardiovascular medicine. The high prevalence of these disorders in the clinical setting mandates effective communication among healthcare providers. The public health significance of these conditions requires clear and consistent terminology for community audiences. Therefore, the goal of this writing group was to suggest definitions, usage, and nomenclature of specific terms commonly used to describe vascular diseases by cardiovascular specialists and primary care communities. The need for clarity is driven by 2 major challenges: (1) the need for use of common keywords for literature searches; and (2) the need for healthcare professionals to use common, reasoned terminology when communicating with each other and with the public. The major structural components of the vascular system are the veins, lymphatic vessels, and arteries. These serve as the basis of the nomenclature system for vascular diseases (Figure). Figure. Major classification of vascular diseases. *Includes inflammatory, artery dysplasias, congenital, traumatic, and infections. In this report, the writing group focuses only on nomenclature that applies to non–coronary artery diseases. Venous and lymphatic diseases were outside the scope of this conference. Diseases of arteries are classified further into atherosclerotic occlusive disorders, nonatherosclerotic occlusive disorders, and aneurysms. …

Peripheral CT angiography for interventional treatment planning

Lower extremity CT angiography (CTA) has evolved into a very effective, widely available and robust imaging modality for patients with peripheral arterial occlusive disease (PAOD). In this article we briefly review the acquisition and contrast administration techniques for 4- through 64-channel peripheral CTA. Visualization of atherosclerotic disease with CTA in general requires 'angiography-like' 3D images (such as volume rendered or maximum intensity projection images), but-notably in the presence of vessel wall calcifications and stents-cross-sectional views (such as curved planar reformations, CPR) are also required to accurately assess the flow lumen of the aorta down to the pedal arteries. Adequate visualization and mapping of atherosclerotic lesions in patients with PAOD is not only a prerequisite for generating a dictated report, but more importantly, standardized postprocessed images are the key to communicating the findings to the treating physician, and they also serve as a treatment planning tool. Treatment decisions (surgical versus transluminal revascularization, or conservative treatment), and percutaneous treatment planning (access site, antegrade versus retrograde puncture) can be made in the majority of patients with PAOD based on lower extremity CT angiograms.