Noncontrast-enhanced magnetic resonance angiography (NCE-MRA) methods have been demonstrated in anatomies throughout the body. Previously established NCE-MRA techniques suffered from long scan times or low sensitivity. Advances in hardware and software have made NCE-MRA scan times clinically feasible. Recent concerns over the safety of gadolinium-based contrast material combined with the expens...

PURPOSE To prospectively evaluate 7 Tesla time-of-flight (TOF) magnetic resonance angiography (MRA) in comparison to 1.5 Tesla TOF MRA and 7 Tesla non-contrast enhanced magnetization-prepared rapid acquisition gradient-echo (MPRAGE) for delineation of unruptured intracranial aneurysms (UIA). MATERIAL AND METHODS Sixteen neurosurgical patients (male n = 5, female n = 11) with single or multipl...

OBJECTIVE The aim of this study was to determine the interobserver and intermodality agreement in the interpretation of time-of-flight (TOF) MR angiography (MRA) for the follow-up of coiled intracranial aneurysms with the Enterprise stent. MATERIALS AND METHODS Two experienced neurointerventionists independently reviewed the follow-up MRA studies of 40 consecutive patients with 44 coiled aneu...

Latar Belakang: Rumah sakit memiliki standariasi pemilihan sekuens yang digunakan untuk pemeriksaan MRA. Di Instalasi Radiologi RSUD Arifin Achmad Provinsi Riau hanya menggunakan satu TOF dari dua sekuen tindakan MRA non kontras yaitu dan PC. Sehubungan dengan hal tersebut, terdapat perlu tujuan mengetahui menghasilkan citra pembuluh darah renal baik.
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Kurzfassung. Im Rahmen dieses Beitrages wird eine automatische Methode zur Extraktion des zerebralen Gefäßsystems aus 3D-Time-of-Flight (TOF)-MRA-Bildsequenzen vorgestellt. Hierbei wird zunächst in einem Vorverarbeitungsschritt das Gehirn von den nicht-zerebralen Gewebeklassen befreit. In einem weiteren Schritt wird aus dem TOF-Datensatz ein Vesselnessund Maximum-Parameterbild berechnet. Diese ...

The combination of 3T and parallel-acquisition techniques holds promise for improved performance of contrast-enhanced MR angiography (MRA), in terms of speed, spatial resolution, and coverage. We present a comparison of 2 MRA techniques, including time-of-flight (TOF) and contrast-enhanced MRA, for detection and evaluation of intracranial aneurysms. Our results show that contrast-enhanced MRA w...

Compressed sensing (CS) reconstructions of under-sampled measurements generate missing data based on assumptions of image sparsity. Non-contrast time-of-flight MR angiography (TOF-MRA) is a good candidate for CS based acceleration, as MRA images feature bright trees of sparse vessels over a well-suppressed anatomical background signal. A short scan time derived from CS is beneficial for patient...

OBJECTIVE This study compared data on the blood flow velocity in the internal carotid artery, which was obtained using the optical flow method (OFM) with digital subtraction angiography (DSA) and the time-of-flight (TOF) technique using magnetic resonance angiography (MRA). MATERIALS AND METHODS Images were obtained from 12 cerebrovascular patients who underwent both brain DSA and MRA imaging...