Abstract In order to improve the safety of digital subtraction angiography (DSA) equipment in treatment cardiovascular diseases, a hybrid collision detection algorithm based on separation distance is proposed by combining oriented bounding box (OBB) with GJK algorithm. Firstly, according structure DSA equipment, real-time position simulated robot operating system (ROS); Then, OBB used envelope ...

Bowhunter's syndrome, also known as rotational occlusion of the vertebral artery, involves posterior circulation ischemia resulting from dynamic compromise of the dominant vertebral artery. This case highlights the importance of provocative digital subtraction angiography in making the diagnosis. A 41-year-old man presented for outpatient neurological evaluation for "lightheadedness" of several...

BACKGROUND AND PURPOSE Although digital subtraction angiography (DSA) is considered the criterion standard for depiction of intracranial aneurysms, it is often difficult to determine the relationship of overlapping vessels to aneurysms when using 2D DSA. We compared 2D and 3D DSA in evaluation of intracranial aneurysms. METHODS Thirty-six consecutive patients with cerebral aneurysms underwent...

for Subarachnoid Hemorrhage The American Journal of Neuroradiology shows different attitudes to state-of-the-art imaging with CT angiography (CTA) after subarachnoid hemorrhage. Kallmes et al opine that CTA should not be done for subarachnoid hemorrhage, whereas Lubicz et al document state-of-the-art CTA imaging of aneurysms. Kallmes et al enshrine selective conventional angiography (DSA), beli...

BACKGROUND AND PURPOSE While the number of CTA examinations is continually increasing compared with DSA examinations, there is little comparative dose information about the different imaging techniques. We compared patient radiation exposure resulting from diagnostic CTA and DSA examinations for both cerebral and cervicocerebral vessels. MATERIALS AND METHODS An anthropomorphic phantom was ir...

BACKGROUND AND PURPOSE In patients with severe internal carotid artery stenoses, thromboendarterectomy significantly reduces both ischemic stroke and the risk of more ischemic attacks. Digital subtraction angiography (DSA) is the accepted preoperative test to determine whether a high-grade stenosis is present and requires surgical therapy. However, DSA has a procedural risk of stroke between 0....

PURPOSE To evaluate magnetic resonance imaging (MRI) and digital subtraction angiography (DSA) findings in popliteal artery entrapment syndrome. MATERIALS AND METHODS Seven limbs of 6 patients (5 men and 1 woman; mean age, 36 +/- 12 years) with popliteal artery entrapment syndrome were evaluated retrospectively. Both MRI and DSA were performed on each affected limb. RESULTS MRI findings est...

BACKGROUND AND PURPOSE Hemodynamics is an important factor in the development and rupture of cerebral aneurysms. Current techniques for measuring blood flow in cerebral aneurysms suffer from various limitations and have not been able to address our clinical needs. A new technique has been developed for effective evaluation of intra-aneurysmal flow based on high-frame-rate cerebral angiography, ...

BACKGROUND AND IMPORTANCE We analyzed the physiopathology of the association between cervical artery dissections (CADs), intracranial aneurysms (IAs), and aneurysmal subarachnoid hemorrhage. CLINICAL PRESENTATION A 43-year-old woman presented with diffuse subarachnoid hemorrhage (Fisher 3; Hunt-Hess 1). computed tomography angiography revealed a cervical internal carotid artery dissection and...

BACKGROUND AND PURPOSE Three-dimensional digital subtraction angiography (DSA) is useful as a supplement to 2D DSA in the pretreatment evaluation of intracranial aneurysms. However, the clinical efficacy of 3D digital angiography (DA) that is generated from unsubtracted rotational images has not been established. The purpose of this study was to assess whether 3D DA provides additional useful i...