Diffusion-weighted MR Imaging of the Brain

Schaefer, Pamela W.; Grant, P. Ellen; González, Ramón

doi:10.1148/radiology.217.2.r00nv24331

Cited by 960 publications

(662 citation statements)

References 90 publications

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“…Several studies on the application of this technique to other regions such as the brain, spinal cord, and breast reported that the usefulness of this technique was limited and inferior to that of EPI 5,24,25 . Kito et al 13 , however, reported that many kinds of tissues in the oral and maxillofacial regions were relatively well visualized in all subjects on FASE DWI (HASTE DWI), but not well on EPI.…”

Section: Discussionmentioning

confidence: 99%

“…Diffusion-weighted imaging (DWI) allows visualization of microscopic water diffusion in biological tissues [2][3][4][5] , and has been applied to head and neck lesions. Many researchers have applied echo-planar imaging (EPI) to DWI of head and neck lesions, as well as diagnosis of diseases of the central nerve system.…”

Section: Introductionmentioning

confidence: 99%

“…The ADC can be useful in characterizing both normal and pathological tissue as it reflects microscopic water diffusion and tissue perfusion in biologic tissues [2][3][4][5] . In many studies, linear regression and gradient b factors of 0 and 1000 sec/mm 2 have been applied to ADC measurement [7][8][9][11][12][13][14]17,18 .…”

Section: Introductionmentioning

confidence: 99%

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Comparison of various methods for quantification of apparent diffusion coefficient of head and neck lesions with HASTE diffusion-weighted MR imaging

Sakamoto

Sasaki

Otonari-Yamamoto

et al. 2012

Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology

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Objectives. The purposes of this retrospective study were to compare various methods of apparent diffusion coefficient (ADC) measurement for head and neck lesions in half-Fourier single-shot turbo spin-echo (HASTE) diffusion-weighted imaging (DWI) and determine the threshold ADC value for predicting malignancy.Study Design. HASTE DW images of 46 lesions (10 cysts, 14 benign tumors, and 22 malignant tumors) were studied retrospectively. The ADC values were compared between 0-1000 method, 500-1000 method, and weighted linear regression (WLR) fit.Results. The highest overall accuracies of 83.3%, 86.1%, and 88.9% were obtained when ADC values of 1.24 × 10 -3 mm 2 /sec (0-1000 method), 0.98 × 10 -3 mm 2 /sec (500-1000 method), and 1.23 × 10 -3 mm 2 /sec (WLR fit), respectively, were used for the threshold.Conclusions. The present results indicate that ADC measurement with HASTE DWI is useful in predicting malignancy of head and neck lesions. 3

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparison of various methods for quantification of apparent diffusion coefficient of head and neck lesions with HASTE diffusion-weighted MR imaging

Sakamoto

Sasaki

Otonari-Yamamoto

et al. 2012

Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology

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“…A direct mathematical relationship exists between the position of these minima and the average mean diameter of the cells. It has already been shown that the PFGSTE NMR experiment is able to probe RBC shape (12) and, especially, to distinguish discocytes and spherocytes from their respective characteristic qspace plots; to characterize CNS structure (13)(14)(15)(16) and to study their pathologies (17)(18)(19).…”

mentioning

confidence: 99%

Erythrocyte‐shape evolution recorded with fast‐measurement NMR diffusion–diffraction

Pagès

Szekely

Kuchel

2008

Magnetic Resonance Imaging

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Purpose:To monitor red blood cell (RBC) shape evolution by 1 H 2 O diffusion-diffraction NMR in time steps comparable to those required for the acquisition of a 31 P NMR spectrum; thus, to correlate RBC mean diameter with ATP concentration after poisoning with NaF. Materials and Methods:Pulsed-field gradient-stimulated echo (PFGSTE) diffusion experiments were recorded on 1 H 2 O in RBC suspensions. Under conditions of restricted diffusion, q-space experiments report on mean RBC diameter. To decrease experiment time, the phase cycling of radiofrequency (RF) pulses was cut to two transients by using unbalanced pairs of gradient pulses. Data processing used a recent digital filter. Differential interference contrast (DIC) light microscopy also recorded shape changes. 31 P NMR spectroscopy gave estimates of mean ATP concentration.Results: NaF caused RBC-shape evolution from discocytes, through various forms of echinocytes, to spherocytes, over ϳ6 h and ϳ10 h at 37°C and 25°C, respectively. ATP declined to ϳ0.5 its normal concentration before the first stage of discocyte transformation; the concentration was 0.0 after ϳ1.5 h and 3.0 h, respectively, at the two temperatures. Conclusion:RBC shape was readily monitored by NMR with a temporal resolution that was useful for correlations with both DIC microscopy and 31 P NMR spectra.

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“…Diffusion-weighted imaging (DWI) of MRI is a recently prevailing technique used to show tissue characteristics based on tissue-specific diffusion motion of water molecules (6,7). Normal endometrium has a high DWI signal intensity because of its high cellularity and abundant cytoplasm (8).…”

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confidence: 99%

Feasibility of diffusion‐weighted MRI for defining placental invasion

Morita

Ueno

Fujimura

et al. 2009

Magnetic Resonance Imaging

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The purpose of this clinical note is to describe the feasibility of using diffusion‐weighted imaging for diagnosing placental invasion with a case of placenta increta and six cases without it. Diffusion‐weighted imaging (DWI) at a b‐value of 1000 sec/mm2 can clearly define the border between the placenta and myometrium because only the placenta shows very high signal intensity. The corresponding image at a b‐value of 0 sec/mm2 shows the myometrium with high signal intensity compared with the surrounding fat. Therefore, fusion of the two images can be used additionally to visualize thickness of the myometrium. As a result, DWI can be used to visualize the focal thinning of the myometrium caused by placenta increta, which has been difficult to diagnose on conventional magnetic resonance imaging sequences without contrast enhancement. However, the use of DWI for placental invasion should be determined following careful consideration of its risks and benefits, as fetus safety has not been established. J. Magn. Reson. Imaging 2009;30:666–671. © 2009 Wiley‐Liss, Inc.

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Diffusion-weighted MR Imaging of the Brain

Cited by 960 publications

References 90 publications

Comparison of various methods for quantification of apparent diffusion coefficient of head and neck lesions with HASTE diffusion-weighted MR imaging

Comparison of various methods for quantification of apparent diffusion coefficient of head and neck lesions with HASTE diffusion-weighted MR imaging

Erythrocyte‐shape evolution recorded with fast‐measurement NMR diffusion–diffraction

Feasibility of diffusion‐weighted MRI for defining placental invasion

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