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AIMS Catheter ablation of the pulmonary veins (PVs) is a promising therapeutic approach for symptomatic atrial fibrillation (AF). The prospective randomized single-centre study 'Mesh Ablator versus Cryoballoon Pulmonary Vein Ablation of Symptomatic Paroxysmal Atrial Fibrillation' (MACPAF; clinicaltrials.gov NCT01061931) compared the efficacy and safety of(More)
Purpose To determine if C-Arm computed tomography (CACT) has added diagnostic value in patients suffering from chronic thromboembolic pulmonary hypertension (CTEPH) with a positive mismatch pattern in ventilation/perfusion single photon emission computed tomography (V/Q SPECT). Materials and Methods 28 patients (23 men, 5 women, 62 ± 18 years) with CTEPH(More)
OBJECTIVES The aim of this study was to assess the potential for radiation dose reduction in collimated C-arm computed tomography (CACT) while maintaining the image quality of the full field of view (FFOV) acquisition. MATERIAL AND METHODS A whole-body anthropomorphic phantom representing a 70-kg male was used in this study. The upper abdomen of the(More)
OBJECTIVES To retrospectively assess the influence of arterial wall calcifications on the accuracy of run-off computed tomographic angiography (CTA) and to analyse whether cardiovascular risk factors are predictors of compromising calcifications. METHODS In 200 consecutive patients who underwent run-off CTA, calcifications were assessed in pelvic, thigh(More)
OBJECTIVES The aim of this study was to analyze the influence of the tube current-time product in multidetector computed tomography angiography on the accuracy of stenosis quantification in a phantom model of occlusive vessel disease. MATERIALS AND METHODS Stenosed pelvic and visceral arteries were simulated using acrylic tubes (inner diameter: small, 4.0(More)
PURPOSE To evaluate the effect of automatic bone and plaque removal on image quality and grading of steno-occlusive lesions in patients undergoing dual energy CT angiography (CTA) of lower extremity. MATERIALS AND METHODS Dual energy (DE) runoff CTA was performed in 50 patients using the following parameters: collimation 2 x 32 x 0.6; tube potentials, 80(More)
OBJECTIVES To assess the influence of different table feeds (TFs) on vascular enhancement and image quality in patients with an abdominal aortic aneurysm (AAA) undergoing computed tomography (CT) angiography of the lower extremities (run-off CTA). METHODS Seventy-nine patients (71 ± 8 years) with an AAA (>30 mm) who underwent run-off CTA between January(More)
PURPOSE To evaluate the accuracy of dual energy (DE)-based plaque removal in a vessel phantom. MATERIALS AND METHODS Acrylic vessel phantoms of different diameters (3, 5, 8 mm), degrees of stenoses (25 - 100%) and plaque densities (300 - 750 HU) were filled with contrast-enhanced blood (150 - 450 HU). Dual source CT was used for simultaneous image(More)
OBJECTIVES To investigate the reliability of CT-angiography of the lower extremities (run-off CTA) to derive a treatment decision in patients with acute and chronic peripheral artery disease (PAD). MATERIALS AND METHODS 314 patients referred for run-off CTA were includ-ed in this retrospective study. First, diagnostic confidence of run-off CTA to derive a(More)
INTRODUCTION To evaluate the image quality provided by MDCT scanners using an ACR phantom an to find out the relationship between CT parameters and physical quantities related to image quality. METHODS A GE Lightspeed VCT and a GE Lightspeed Pro 16 are used. The ACR phantom consists of four modules for evaluating physical parameters. The image quality(More)