Comparing real‐world advantages for the clinical neuroradiologist between a high field (3 T), a phased array (1.5 T) vs. a single‐channel 1.5‐T MR system

Orbach, Darren B.; Wu, Chris Y.; Law, Meng; Babb, James S.; Lee, Ray; Padua, Abraham; Knopp, Edmond A.

doi:10.1002/jmri.20612

Cited by 9 publications

(6 citation statements)

References 18 publications

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“…We focused on elderly patients and noticed a higher incidence of HARM in our population compared with the result obtained by Latour et al [20,22]. Partially, this may be explained by the use of 3-T MRI with a higher resolution [31,32], but the higher incidence of HARM could also be due to a higher vulnerability of the BBB in older patients. Stroke severity and WML were not associated with HARM.…”

Section: Discussioncontrasting

confidence: 69%

Hyperintense acute reperfusion marker on FLAIR is not associated with early haemorrhagic transformation in the elderly

et al. 2010

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Section: Discussioncontrasting

confidence: 69%

Hyperintense acute reperfusion marker on FLAIR is not associated with early haemorrhagic transformation in the elderly

et al. 2010

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“…The 25 patients (15 male) had a median age of 21 years (range 13-50) at surgery. The median (interquartile range) (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) months. FCD2 was located in the frontal lobe in 22 cases (including nine in the central region and one in the insula), 2 lesions were parietal, and one was in the temporal lobe, with 12 lesions in the right hemisphere and 13 in the left hemisphere.…”

Section: Resultsmentioning

confidence: 99%

“…12,13 Yet, this improvement might not solely be due to the increase in field strength but rather to the use of phased array coils. [13][14][15] The benefit of 3T MRI, if any, is likely not identical for all types of epileptic lesions. Hippocampal sclerosis and tissue loss are reported to be best seen at 1.5T, 14,16 whereas cortical development lesions, including FCDs, would be best seen at 3T.…”

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confidence: 99%

3TMRIimproves the detection of transmantle sign in type 2 focal cortical dysplasia

et al. 2013

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SUMMARYPurpose: Type 2 focal cortical dysplasia (FCD2) is one of the main causes of refractory partial epilepsy, but often remains overlooked by MRI. This study aimed to elucidate whether 3T MRI offers better detection and characterization of FCD2 than 1.5T, using similar coils and acquisition time. Methods: Two independent readers reviewed the 1.5T and 3T MR images of 25 patients with histologically proven FCD2. For both magnetic fields, the ability to detect a lesion was analyzed. We compared the identification of each of the five criteria typical of FCD2 (cortical thickening, blurring, cortical signal changes, subcortical signal changes, and "transmantle" sign) and artifacts, using a four-point scale (0-3). Interobserver reliability for lesion detection was calculated. Key Findings: Seventeen lesions (68%) were detected at 3T, two of which were overlooked at 1.5T. Interobserver reliability was better at 3T (j = 1) than at 1.5T (j = 0.83). The transmantle sign was more clearly identified at 3T than 1.5T (mean visualization score: 1.72 vs. 0.56; p = 0.002). Significance: The use of 3T MRI in patients suspected of type 2 FCD improves the detection rate and the lesion characterization owing to the transmantle sign being more clearly seen at 3T. This point is of interest, since this feature is considered as an MR signature of FCD2.

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“…[5][6][7][8][9] The advent of clinical MR imaging at 3.0T and better signal-to-noise ratio (SNR) and higher resolution promise to further improve detection of brain metastases. [10][11][12][13] However, changing from 1.5 to 3.0T lengthens T1 relaxation time of brain tissue, thereby decreasing the contrast between gray (GM) and white matter (WM) 14 in T1-weighted images and the capacity to discriminate cerebral anatomy. 15 A related issue is that speciˆc absorption rate (SAR) at 3.0T is 4 times higher than at 1.5T.…”

Section: Introductionmentioning

confidence: 99%

Contrast-enhanced MR Imaging of Metastatic Brain Tumor at 3 Tesla: Utility of T1-weighted SPACE Compared with 2D Spin Echo and 3D Gradient Echo Sequence

Komada

Naganawa

Ogawa

et al. 2008

MRMS

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We evaluated the newly developed whole-brain, isotropic, 3-dimensional turbo spin-echo imaging with variable flip angle echo train (SPACE) for contrast-enhanced T(1)-weighted imaging in detecting brain metastases at 3 tesla (T). Twenty-two patients with suspected brain metastases underwent postcontrast study with SPACE, magnetization-prepared rapid gradient-echo (MP-RAGE), and 2-dimensional T(1)-weighted spin echo (2D-SE) imaging at 3T. We quantitatively compared SPACE, MP-RAGE, and 2D-SE images by using signal-to-noise ratios (SNRs) for gray matter (GM) and white matter (WM) and contrast-to-noise ratios (CNRs) for GM-to-WM, lesion-to-GM, and lesion-to-WM. Two blinded radiologists evaluated the detection of brain metastases by segment-by-segment analysis and continuously-distributed test. The CNR between GM and WM was significantly higher on MP-RAGE images than on SPACE images (P<0.01). The CNRs for lesion-to-GM and lesion-to-WM were significantly higher on SPACE images than on MP-RAGE images (P<0.01). There was no significant difference in each sequence in detection of brain metastases by segment-by-segment analysis and the continuously-distributed test. However, in some cases, the lesions were easier to detect in SPACE images than in other sequences, and also the vascular signals, which sometimes mimic lesions in MP-RAGE and 2D-SE images, were suppressed in SPACE images. In detection of brain metastases at 3T magnetic resonance (MR) imaging, SPACE imaging may provide an effective, alternative approach to MP-RAGE imaging for 3D T(1)-weighted imaging.

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Comparing real‐world advantages for the clinical neuroradiologist between a high field (3 T), a phased array (1.5 T) vs. a single‐channel 1.5‐T MR system

Cited by 9 publications

References 18 publications

Hyperintense acute reperfusion marker on FLAIR is not associated with early haemorrhagic transformation in the elderly

Hyperintense acute reperfusion marker on FLAIR is not associated with early haemorrhagic transformation in the elderly

3TMRIimproves the detection of transmantle sign in type 2 focal cortical dysplasia

Contrast-enhanced MR Imaging of Metastatic Brain Tumor at 3 Tesla: Utility of T1-weighted SPACE Compared with 2D Spin Echo and 3D Gradient Echo Sequence

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