Diffusion-weighted imaging of the brain: comparison of stimulated- and spin-echo echo-planar sequences

Background Echo-planar imaging (EPI)-diffusion-weighted imaging (DWI) may take unclear image affected by susceptibility, geometric distortions and chemical shift artifacts. Purpose To compare the image quality and usefulness of EPI-DWI and turbo spin echo (TSE)-DWI in female patients who required imaging of the pelvis. Material and Methods All 57 patients were examined with a 3.0-T MR scanner. Both TSE- and EPI-DWI were performed with b values of 0 and 1000 s/mm2. We compared geometric distortion, the contrast ratio (CR) of the myometrium to the muscle and the apparent diffusion coefficient (ADC) values for the myometrium and lesion. Two radiologists scored the TSE- and EPI-DWI of each patient for qualitative evaluation. Results The mean percent distortion was significantly smaller with TSE- than EPI-DWI ( p = 0.00). The CR was significantly higher with TSE- than EPI-DWI ( p = 0.003). There was a significant difference in the ADC value for the uterus and lesions between the EPI- and TSE-DWI ( p < 0.05). Finally, the ADC values of cancer were significantly different from those for the uterus and benign with both the two sequences ( p < 0.05). The scores for ghosting artifacts were higher with TSE- than EPI-DWI ( p = 0.019). But there were no significant differences between TSE- and EPI-DWI with regard to image contrast and overall image quality. Conclusion TSE-DWI on the female pelvis by 3T MRI produces less distortion and higher CR than EPI-DWI, but there is no difference in contrast and image quality.

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A characteristic feature of acute haematomas in the brain on echo-planar diffusion-weighted imaging

Neuroradiology ◽

10.1007/s00234-002-0860-5 ◽

2002 ◽

Vol 44 (11) ◽

pp. 907-911 ◽

Cited By ~ 11

Author(s):

Morita N. ◽

Harada M. ◽

Yoneda K. ◽

Nishitani H. ◽

Uno M.

Keyword(s):

Characteristic Feature ◽

Diffusion Weighted Imaging ◽

Diffusion Weighted ◽

Echo Planar ◽

The Brain

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Evaluation of Thin-slice Coronal Single-shot Turbo Spin-echo Diffusion-weighted Imaging of the Hand: A Comparison with Conventional Echo-planar Diffusion-weighted Imaging

Magnetic Resonance in Medical Sciences ◽

10.2463/mrms.tn-2019-0115 ◽

2020 ◽

Vol 19 (4) ◽

pp. 382-388 ◽

Cited By ~ 1

Author(s):

Masaki Ogawa ◽

Motoo Nakagawa ◽

Nobuyuki Arai ◽

Hirohito Kan ◽

Shota Ohba ◽

...

Keyword(s):

Diffusion Weighted Imaging ◽

Spin Echo ◽

Single Shot ◽

Turbo Spin Echo ◽

Thin Slice ◽

Turbo Spin ◽

Diffusion Weighted ◽

Echo Planar

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Evaluating the Origin of the Brain Metastatic Tumors by Using DWI Parameters

International Clinical Neuroscience Journal ◽

10.15171/icnj.2019.18 ◽

2019 ◽

Vol 6 (3) ◽

pp. 92-97

Author(s):

Farnoush Mousavi ◽

Fariborz Faeghi ◽

Hamed Javadian ◽

Hamidreza Haghighatkhah ◽

Saeed Oraee-Yazdani

Keyword(s):

Breast Cancer ◽

Lung Cancer ◽

Brain Metastases ◽

Diffusion Weighted Imaging ◽

Spin Echo ◽

Metastatic Tumors ◽

Diffusion Weighted ◽

Spin Echo Sequence ◽

Adc Values ◽

The Brain

Background: Brain metastases are the most common tumors in the human central nervous system (CNS), with an occurrence 10 times higher than primary brain tumors in adults. A radiologist usually diagnoses these tumors. Typically, magnetic resonance imaging (MRI) has been used to evaluate the status and number of metastases, the design of surgical treatment or radiotherapy, and the response to treatment. This study aimed to consider the origin of metastatic tumors of the brain using diffusionweighted imaging sequence. Methods: In this study, 95 lesions observed in 51 patients with different types of brain metastasis who analyzed with standard brain MRI protocols such as T2-weighted fast spin-echo in sagittal, coronal and axial planes and T1-weighted spin-echo sequences before and after injection of contrast enhancement and diffusion-weighted imaging. The diffusion-weighted imaging included an echoplanar spin-echo sequence with two b values (0,1000 s/mm) and calculated apparent diffusion coefficient (ADC) maps. We measured the ADC-value on normalized ADC maps and compared them with different methods. ANOVA was used to compare ADC among all groups as well as T-test for every two groups. Results: The results showed that patients with lung cancer (squamous cell carcinoma, SCC) had the lowest mean ADC (658.70*10-3 mm2 /s) and breast cancer patients with the highest mean ADC(935.52*10-3 mm2 /s). This study demonstrated that most Brain metastases had low and intermediate ADC values. The analysis showed no significant difference among all groups. However, ADC values in breast cancer and kidney and lung (adenocarcinoma) were statistically higher in comparison to other groups. There were no critical discrepancies between ADC values in brain metastases from Breast cancer and lung cancer (adenocarcinoma) and kidney. Conclusion: It seems that evaluating the origin of the brain metastatic tumors by using diffusion imaging (DWI) parameters could be helpful to prevent invasive methods like biopsies in some situations. Although it needs more studies to achieve this purpose.

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