scholarly journals 1.5 Tesla Non-ultrashort but Short Echo Time Magnetic Resonance Angiography Describes the Arteries Near a Clipped Cerebral Aneurysm

Cureus ◽  
2021 ◽  
Author(s):  
Yoichi Higo ◽  
Sakura Komagata ◽  
Masahito Katsuki ◽  
Shin Kawamura ◽  
Akihito Koh
Keyword(s):  
Magnetic Resonance ◽  
Magnetic Resonance Angiography ◽  
Cerebral Aneurysm ◽  
Echo Time ◽  
Short Echo Time

scholarly journals Three tesla magnetic resonance angiography with ultrashort echo time describes the arteries near the cerebral aneurysm with clip and the peripheral cerebral arteries

2020 ◽  
Vol 11 ◽  
pp. 224 ◽  
Author(s):  
Masahito Katsuki ◽  
Norio Narita ◽  
Dan Ozaki ◽  
Yoshimichi Sato ◽  
Saki Iwata ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Magnetic Resonance Angiography ◽  
Cerebral Aneurysm ◽  
Cerebral Vasospasm ◽  
Cerebral Arteries ◽  
Main Trunk ◽  
Ultrashort Echo Time ◽  
Invasive Method ◽  
Echo Time ◽  
Enhanced Computed Tomography

Background: The assessment of the clipped cerebral aneurysm and the cerebral arteries after the treatment of subarachnoid hemorrhage (SAH) is important to find aneurysm regrowth or postoperative cerebral vasospasm. Usually, contrast-enhanced computed tomography angiography is performed for the evaluation of the arteries, but it has side effects of contrast medium. Time-of-flight magnetic resonance angiography (MRA) is a fast and non-invasive method, but clip-induced artifact limits assessment of the artery in the vicinity of the clip. 1.5T MRA with ultrashort echo time (UTE) reduces metal artifact, but the obtained image is too rough to evaluate the aneurysm remnant, and the description range is too narrow to assess the cerebral vasospasm. We routinely use SIGNA Pioneer 3.0T (GE Healthcare Life Sciences, Buckinghamshire, England) and perform SILENT SCAN with UTE-MRA for the postoperative assessment of the clipped aneurysm and cerebral arteries for SAH patients treated by clipping. It has better image quality and describes arteries with a wide description range, so it possesses the potential to overcome the disadvantages of 1.5T UTE-MRA. Case Description: We presented a representative SAH patient who postoperatively underwent 3.0T UTE- MRA after clipping. The artery near the clipped aneurysm was evaluated in detail, and the cerebral arteries were described from the main trunk to the peripheral parts with a wide description range, which enabled the assessment of cerebral vasospasm. Conclusion: 3.0T UTE-MRA may be helpful for the usual assessment of the arteries after clipping and cerebral vasospasm in the future.

scholarly journals Magnetic resonance angiography with ultrashort echo time evaluates cerebral aneurysm with clip

2020 ◽  
Vol 11 ◽  
pp. 65 ◽  
Author(s):  
Masahito Katsuki ◽  
Yukinari Kakizawa ◽  
Yasunaga Yamamoto ◽  
Akihiro Nishikawa ◽  
Naomichi Wada ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Magnetic Resonance Angiography ◽  
Cerebral Aneurysm ◽  
Fast Method ◽  
Ultrashort Echo Time ◽  
Non Invasive ◽  
Contrast Enhanced ◽  
Echo Time ◽  
Enhanced Computed Tomography

Contrast-enhanced computed tomography angiography is usually valuable for the evaluation of clipped cerebral aneurysm, but it has side effects of contrast medium. Time-of-flight magnetic resonance angiography (MRA) is a non-invasive and fast method. However, clip-induced artifact limits assessment of the artery in the vicinity of a clip. MRA with ultrashort echo time (TE) reduces metal artifact. We use MAGNETOM Aera 1.5T (SIEMENS, München, Germany) and perform pointwise encoding time reduction with radial acquisition (PETRA)-MRA using ultrashort TE for the assessment of the cerebral aneurysm after clipping. We, herein, presented two representative cases with a clipped aneurysm which could be evaluated by PETRA- MRA. Especially in one of them, the neck remnant was revealed by PETRA-MRA. PETRA-MRA can reduce the time and the invasiveness and may be helpful for the usual follow-up of the clipped aneurysm with the development of MRA technology in the future.

In vitro imaging of kidney stones using ultra-short echo-time magnetic resonance

2015 ◽  
Author(s):  
El-Sayed Ibrahim ◽  
Robert Pooley ◽  
Joseph Cernigliaro ◽  
Mellena Bridges ◽  
Jamie Giesbrandt ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Kidney Stones ◽  
Echo Time ◽  
Short Echo Time

Metabolite concentrations in supraventricular white matter from teenage to early old age: A short echo time 1h magnetic resonance spectroscopy (MRS) study

2010 ◽  
Vol 51 (3) ◽  
pp. 309-315 ◽  
Author(s):  
Raili Raininko ◽  
Peter Mattsson
Keyword(s):  
White Matter ◽  
Magnetic Resonance ◽  
Magnetic Resonance Spectroscopy ◽  
Resonance Spectroscopy ◽  
Age Dependence ◽  
Total N ◽  
Metabolite Concentrations ◽  
Repetition Time ◽  
Echo Time ◽  
Short Echo Time

Background: Age- and sex-related changes of metabolites in healthy adult brains have been examined with different 1H magnetic resonance spectroscopy (MRS) methods in varying populations, and with differing results. A long repetition time and short echo time technique reduces quantification errors due to T1 and T2 relaxation effects and makes it possible to measure metabolites with short T2 relaxation times. Purpose: To examine the effect of age on the metabolite concentrations measured by 1H MRS in normal supraventricular white matter using a long repetition time (TR) and a short echo time (TE). Material and Methods: Supraventricular white matter of 57 healthy subjects (25 women, 32 men), aged 13 to 72 years, was examined with a single-voxel MRS at 1.5T using a TR of 6000 ms and a TE of 22 ms. Tissue water was used as a reference in quantification. Results: Myoinositol increased slightly and total N-acetyl aspartate (NAA) decreased slightly with increasing age. Glutamine/glutamate complex (Glx) showed U-shaped age dependence, with highest concentrations in the youngest and oldest subjects. No significant age dependence was found in total choline and total creatine. No gender differences were found. Macromolecule/ lipid (ML) fractions were reliably measurable only in 36/57 or even fewer subjects and showed very large deviations. Conclusion: The concentrations of several metabolites in cerebral supraventricular white matter are age dependent on 1H MRS, even in young and middle-aged people, and age dependency can be nonlinear. Each 1H MRS study of the brain should therefore take age into account, whereas sex does not appear to be so important. The use of macromolecule and lipid evaluations is compromised by less successful quantification and large variations in healthy people.

Sign in / Sign up

Export Citation Format

Share Document