Imaging Parameter Optimization of 3D Phase Contrast-MRA to Reduce Susceptibility-artifact and Radiofrequency-shielding around the Intracranial Stent

Kiriki, Masato; Jomoto, Wataru; Ikeda, Takashi; Kotoura, Noriko

doi:10.6009/jjrt.2018_jsrt_74.11.1293

Cited by 3 publications

(7 citation statements)

References 15 publications

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“…24) The disadvantages of SILENT MRA were as follows: the total required time is longer in SILENT MRA than that in TOF-MRA because SILENT MRA needs ASL preparation 7) and subtraction processing. 17) As another problem, the signal in UTE-MRA is weaker than that in TOF-MRA, especially in the distal part from the neck where blood was labeled. 3) Furthermore, ASL may not always be performed if there is severe neck carotid artery stenosis or metal around the neck, such as an intubation tube cuff.…”

Section: Discussionmentioning

confidence: 99%

“… 12) Also, the cost and the availability of the 3 tesla magnetic resonance imaging (MRI) are problems. 17) Furthermore, in this study, all patients were treated using the fourth-generation YASARGIL Aneurysm Clip System made of TiAl6V4 titanium alloy (ISO 5832-2). We could not investigate metal artifacts from other clips made of other materials.…”

Section: Discussionmentioning

confidence: 99%

“…3,5,[6][7][8][9][10][11][12][13][14] UTE-MRA is a sequence using arterial spin labeling (ASL) technique 15) or inversion recovery pulses 16) as well as subtraction processing. 7,[15][16][17] SILENT MRA 15) (GE Healthcare Life Sciences, Buckinghamshire, UK), 12,14) one of the UTE-MRA sequences, makes the blood within the carotid arteries "labeled" using a long radiofrequency inversion pulse. Once the blood is labeled, it is allowed to flow into the arteries and to be captured by the MR acquisition (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Usefulness of 3 Tesla Ultrashort Echo Time Magnetic Resonance Angiography (UTE-MRA, SILENT-MRA) for Evaluation of the Mother Vessel after Cerebral Aneurysm Clipping: Case Series of 19 Patients

Katsuki

Narita

Ishida

et al. 2021

Neurol. Med. Chir.(Tokyo)

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It is important to assess the cerebral arteries near the clip after cerebral aneurysm clipping. Contrast-enhanced computed tomography angiography has side effects of contrast medium and radiation exposure. Time-of-flight magnetic resonance angiography (TOF-MRA) is a fast and non-invasive method, but clip-induced artifact limits the assessment around the clip. Recently, 3 tesla MRA with ultrashort echo time called SILENT MRA (GE Healthcare Life Sciences, UK) has been reported to have the potential to overcome these disadvantages. We herein present consecutive 19 cerebral aneurysm patients treated by clipping and evaluated using SILENT MRA. The 19 patients (15 women and 4 men) underwent TOF-MRA and SILENT MRA during the same scan session. Two neurosurgeons independently assessed the visibility of the mother vessel at the clipping site in TOF-MRA and SILENT MRA. We also investigated the factors related to visibility in SILENT MRA. All patients' mother vessels were not described in TOF-MRA, and that of 16 patients (84%) were described in SILENT MRA. Overall agreement was 100% in the two neurosurgeons, and the fixed marginal kappa = 1.00 (95% CI: 0.36-1.00). Univariate analysis revealed that larger aneurysm dome and long clip blade length contributed to the visibility of the mother vessel in SILENT MRA. (p = 0.023, 0.007, each). In conclusion, SILENT MRA can be applied for the assessment of the arteries and aneurysm neck remnants near the clip. Using clips with long blade and ligation with its tip would be related to the visibility of the mother vessels in SILENT MRA.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Usefulness of 3 Tesla Ultrashort Echo Time Magnetic Resonance Angiography (UTE-MRA, SILENT-MRA) for Evaluation of the Mother Vessel after Cerebral Aneurysm Clipping: Case Series of 19 Patients

Katsuki

Narita

Ishida

et al. 2021

Neurol. Med. Chir.(Tokyo)

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“…However, the total required time is longer in UTE-MRA than that in TOF-MRA because UTE-MRA needs arterial spin labeling (ASL) preparation,[ 8 ] multiple scans, and subtraction processing. [ 6 ] As another problem, the signal in UTE-MRA is weaker than that in TOF- MRA. [ 3 ] Furthermore, ASL may not always be performed if there is metal around the neck, such as an intubation tube cuff.…”

Section: Discussionmentioning

confidence: 99%

“…Compared to 1.5T UTE-MRA, 3.0T UTE- MRA has the better image quality and wider description range, but the cost and the availability of the 3.0T MRI are problems. [ 6 ] In summary, 3.0T UTE-MRA can reduce the time and the invasiveness compared to CTA as well as overcome the disadvantages of 1.5T UTE-MRA, but it also has some disadvantages compared to the other sequences. In addition, the clip-induced metal artifact should be further investigated in 3.0T UTE-MRI,[ 11 ] and it should be clarified what kind of aneurysm, clip shape, and surgical procedure, like how to apply the clip, can be applied to 3.0T UTE-MRI.…”

Section: Discussionmentioning

confidence: 99%

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

Katsuki

Narita

Ozaki

et al. 2020

Surgical Neurology International

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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.

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

Higo¹,

Komagata²,

Katsuki³

et al. 2021

Cureus

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Cerebral aneurysm and mother artery assessment after clipping is essential to evaluate aneurysm remnant, regrowth, and clip slippage. Usually, cerebral angiography and contrast-enhanced computed tomography angiography (CTA) are used for the evaluation, but they have the side effect of contrast medium and are time-consuming. Time-of-flight magnetic resonance angiography (TOF-MRA) is a non-invasive and fast modality, but clip-induced artifacts limit the signal near the metal clip. Recent ultrashort echo time (UTE)-MRA reduces metal artifacts but its availability is still low worldwide. Therefore, we developed a modified TOF-MRA sequence, named short TE-MRA, using Optima MR 360 1.5T Advance (GE Healthcare Life Sciences, Buckinghamshire, UK). It could describe the artery near the clip using general MRA equipment without recent UTE-MRA technology. We present a subarachnoid hemorrhage patient who underwent short TE-MRA about a year after clipping for the aneurysms at the bilateral internal carotid arteries. Short TE-MRA described the left internal carotid, middle cerebral, and anterior cerebral arteries. The right middle and anterior cerebral arteries were described, but the right internal carotid artery was not. Normal TOF-MRA could not describe them. Without recent UTE-MRA technology, short TE-MRA might be an alternative method for evaluating the artery near the clip. Short TE-MRA can be performed by general MRA equipment with a little time, so it may be helpful until UTE-MRA is widely used. Further research is needed on whether short TE-MRA can describe the aneurysm remnant, regrowth, and clip slippage up to the clinically useful level.

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Imaging Parameter Optimization of 3D Phase Contrast-MRA to Reduce Susceptibility-artifact and Radiofrequency-shielding around the Intracranial Stent

Cited by 3 publications

References 15 publications

Usefulness of 3 Tesla Ultrashort Echo Time Magnetic Resonance Angiography (UTE-MRA, SILENT-MRA) for Evaluation of the Mother Vessel after Cerebral Aneurysm Clipping: Case Series of 19 Patients

Usefulness of 3 Tesla Ultrashort Echo Time Magnetic Resonance Angiography (UTE-MRA, SILENT-MRA) for Evaluation of the Mother Vessel after Cerebral Aneurysm Clipping: Case Series of 19 Patients

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

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

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