Ultrashort-TE 4D MR Angiography in cerebrovascular diseases

2020 ◽  
Author(s):  
SHIGEKI AOKI ◽  
Yutaka Ikenouchi ◽  
Michimasa Suzuki
Keyword(s):  
Mr Angiography ◽  
Cerebrovascular Diseases

Studio dell'arco aortico e dell'origine dei tronchi sovraortici: Validazione di una tecnica angio-RM con bolo di gadolinio

1997 ◽  
Vol 10 (2_suppl) ◽  
pp. 113-115
Author(s):  
L. Strada ◽  
N. Anzalone ◽  
F. Scomazzoni ◽  
D. Origgi ◽  
R. Castellano ◽  
...  
Keyword(s):  
Aortic Arch ◽  
Mr Angiography ◽  
Test Dose ◽  
Cerebrovascular Diseases ◽  
Acquisition Time ◽  
Imaging Method ◽  
Vertebral Arteries ◽  
Power Injector ◽  
Body Coil ◽  
Accurate Imaging

Our purpose was to evaluate the utility of Gadolinium-enhanced MR angiography in the study of the aortic arch and arch vessels disease. Twelve patients with cerebrovascular diseases underwent MR examination at 1.5 T with a body coil and 3D FISP sequence (TRITE/flip angle 5.0–6.0/2.0/50°; acquisition time: 26–31 sec). Gadolinium infusion was timed for maximum arterial contrast during acquisition of central portion of K-space. For this purpose we administer a “test dose” of 2 ml of Gadolinium with a power injector. In all examinations we had a good visualization of the aortic arch and arch vessels up to carotid bifurcations. The evaluation of vertebral arteries and their origins was sometimes suboptimal because of the lower spatial resolution. Our preliminary results indicate that 3D Gadolinium enhanced MR angiography has the potential to become an accurate imaging method for detection of arch vessels diseases.

scholarly journals Usefulness of MR Angiography with Magnetization Transfer Contrast in Screening for Cerebrovascular Diseases.

1995 ◽  
Vol 44 (4) ◽  
pp. 565-568
Author(s):  
Kenji OGIHARA ◽  
Tadahisa TAKIZAWA ◽  
Masaaki ITIMURA ◽  
Satosi YOSHIDA ◽  
Tetuya SAITOU ◽  
...  
Keyword(s):  
Mr Angiography ◽  
Magnetization Transfer ◽  
Cerebrovascular Diseases ◽  
Magnetization Transfer Contrast

MR Angiography Overused in Assessing Vertigo

2006 ◽  
Vol 39 (5) ◽  
pp. 13
Author(s):  
ELAINE ZABLOCKI
Keyword(s):  
Mr Angiography

Time-resolved, contrast-enhanced 3D MR angiography in the subclavian steal effect

VASA ◽  
2010 ◽  
Vol 39 (1) ◽  
pp. 85-93 ◽  
Author(s):  
Schubert
Keyword(s):  
Mr Angiography ◽  
Time Resolved ◽  
Time To Peak ◽  
Vertebral Arteries ◽  
Subclavian Steal ◽  
Cerebrovascular Events ◽  
Graphic Analysis ◽  
Contrast Enhanced ◽  
Hemodynamic Information ◽  
Supraaortic Vessels

The subclavian steal effect indicates atherosclerotic disease of the supraaortic vessels but rarely causes cerebrovascular events in itself. Noninvasive imaging providing detailed anatomic as well as hemodynamic information would therefore be desirable. From a group of 25 consecutive patients referred for MR angiography, four with absent or highly attenuated signal in one of the vertebral arteries on 3D multislab time-of-flight MR angiography were selected to undergo 3D time-resolved contrast-enhanced MR angiography. The time-resolved 3D contrast series (source images and MIPs) were evaluated visually and by graphic analysis of time-intensity curves derived from the respective V1 and V3 segments of both vertebral arteries on the source images. In two cases with high-grade proximal left subclavian stenosis, time-resolved 3D ce-MRA was able to visualise retrograde contrast filling of the left VA. There was a marked delay in time-to-peak between the left and right V1 segments in one case and a shallower slope of enhancement in another. In the other two cases, there was complete or collateralised segmental occlusion of the VAs.

Assessment of extracranial-intracranial bypass in Moyamoya disease using 3T time-of-flight MR angiography: Comparison with CT angiography

VASA ◽  
2014 ◽  
Vol 43 (4) ◽  
pp. 278-283 ◽  
Author(s):  
Qian Chen ◽  
Rongfeng Qi ◽  
Xiaoqing Cheng ◽  
Changsheng Zhou ◽  
Song Luo ◽  
...  
Keyword(s):  
Image Quality ◽  
Moyamoya Disease ◽  
Mr Angiography ◽  
Time Of Flight ◽  
Consecutive Series ◽  
Tof Mra ◽  
Bypass Patency ◽  
Significant Difference ◽  
Contrast Technique ◽  
Vessel Integrity

Background: To evaluate the value of time-of-flight MR angiography (TOF MRA) for the assessment of extracranial-intracranial (EC-IC) bypass in Moyamoya disease in comparison with computed tomography angiography (CTA). Patients and methods: A consecutive series of 23 patients with Moyamoya disease were analyzed retrospectively. Twenty three patients underwent 25 procedures of extracranial-intracranial bypass. Cranial CTA was performed within one week after the surgery to assess bypass patency. Then TOF MRA was scanned within 24 h after CTA on a 3T MRI system. Using 5-point scales (0 = poor to 4 = excellent), two radiologists rated the image quality and vessel integrity of bypass for three segments (extracranial, trepanation, intracranial). Results: Image quality was high in both CTA and TOF MRA (mean quality score 3.84 ± 0.37 and 3.8 ± 0.41), without statistical difference (p = 0.66). Mean scores of TOF MRA with respect to bypass visualization were higher than CTA in the intracranial segment (p = 0.026). No significant difference of bypass visualization regarding the extracranial and trepanation segments was found between TOF MRA and CTA (p = 0.66 and p = 0.34, respectively). For the trepanation segment, TOF MRA showed pseudo lesions in 2 of all 25 cases. Conclusions: 3T TOF MRA, a non-contrast technique not exposing the patients to radiation, proved to be at least equal to CTA for the assessment of EC-IC bypass, and even superior to CTA with respect to the intracranial segment. In addition, readers should be aware of a potential overestimation showing focal pseudo lesions of the bypass at the trepanation segment in TOF MRA.

Coarctation of the abdominal aorta: Demonstration of a rare anomaly using contrast-enhanced MR-angiography

VASA ◽  
2009 ◽  
Vol 38 (1) ◽  
pp. 66-71 ◽  
Author(s):  
Schubert
Keyword(s):  
Abdominal Aorta ◽  
Mr Angiography ◽  
Parallel Imaging ◽  
Left Renal Vein ◽  
Systemic Hypertension ◽  
Contrast Enhanced ◽  
Younger Age ◽  
Maximum Intensity Projections ◽  
Collateral Vessels ◽  
First Time

We describe a case of aortic coarctation at the level of the infrarenal abdominal aorta which is encountered in less than six individuals in one million. In contrast to aortic narrowing above or including the renal arteries, this seems to be a relatively benign anomaly without systemic hypertension or impaired renal function. For the first time in this type of anomaly, contrast-enhanced MR angiography (ce-MRA) on a multi-receiver channel MR system, with an 8-channel phased array coil and parallel imaging was used. Ce-MRA displayed a tortuous, narrowed aortic segment that was found to be associated with mesenteric artery stenosis and compression of the orthotopic left renal vein, also known as the nutcracker phenomenon. All major aortic branches could be depicted using 3D surface-shaded displays and subvolume maximum intensity projections (MIPs). Collateral vessels of the abdominal wall were identified using whole-volume MIPs. Since the majority of aortic malformations are diagnosed at a younger age, and many suffer from renal insufficiency, we conclude that ce-MRA will eventually place conventional DSA as the modality of choice in malformations of the abdominal aorta.

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