Reliability of Synthetic Brain MRI for Assessment of Ischemic Stroke with Phantom Validation of a Relaxation Time Determination Method
The reliability of relaxation time measures in synthetic magnetic resonance images (MRIs) of homemade phantoms were validated, and the diagnostic suitability of synthetic imaging was compared to that of conventional MRIs for detecting ischemic lesions. Phantoms filled with aqueous cupric-sulfate (Cu...
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doaj-abe981103a3b4fa3996285402b566f8c2020-11-25T03:44:42ZengMDPI AGJournal of Clinical Medicine2077-03832020-06-0191857185710.3390/jcm9061857Reliability of Synthetic Brain MRI for Assessment of Ischemic Stroke with Phantom Validation of a Relaxation Time Determination MethodChia-Wei Li0Ai-Ling Hsu1Chi-Wen C. Huang2Shih-Hung Yang3Chien-Yuan Lin4Charng-Chyi Shieh5Wing P. Chan6Department of Radiology, Wan Fang Hospital, Taipei Medical University, Taipei 116, TaiwanDepartment of Radiology, Wan Fang Hospital, Taipei Medical University, Taipei 116, TaiwanDepartment of Radiology, Wan Fang Hospital, Taipei Medical University, Taipei 116, TaiwanDepartment of Radiology, Wan Fang Hospital, Taipei Medical University, Taipei 116, TaiwanGE Healthcare, Taipei 104, TaiwanGE Healthcare, Taipei 104, TaiwanDepartment of Radiology, Wan Fang Hospital, Taipei Medical University, Taipei 116, TaiwanThe reliability of relaxation time measures in synthetic magnetic resonance images (MRIs) of homemade phantoms were validated, and the diagnostic suitability of synthetic imaging was compared to that of conventional MRIs for detecting ischemic lesions. Phantoms filled with aqueous cupric-sulfate (CuSO<sub>4</sub>) were designed to mimic spin-lattice (T<sub>1</sub>) and spin-spin (T<sub>2</sub>) relaxation properties and were used to compare their accuracies and stabilities between synthetic and conventional scans of various brain tissues. To validate the accuracy of synthetic imaging in ischemic stroke diagnoses, the synthetic and clinical scans of 18 patients with ischemic stroke were compared, and the quantitative contrast-to-noise ratios (CNRs) were measured, using the Friedman test to determine significance in differences. Results using the phantoms showed no significant differences in the interday and intersession synthetic quantitative T<sub>1</sub> and T<sub>2</sub> values. However, between synthetic and referenced T<sub>1</sub> and T<sub>2</sub> values, differences were larger for longer relaxation times, showing that image intensities in synthetic scans are relatively inaccurate in the cerebrospinal fluid (CSF). Similarly, CNRs in CSF regions of stroke patients were significantly different on synthetic T<sub>2</sub>-weighted and T<sub>2</sub>-fluid-attenuated inversion recovery images. In contrast, differences in stroke lesions were insignificant between the two. Therefore, interday and intersession synthetic T<sub>1</sub> and T<sub>2</sub> values are highly reliable, and discrepancies in synthetic T<sub>1</sub> and T<sub>2</sub> relaxation times and image contrasts in CSF regions do not affect stroke lesion diagnoses. Additionally, quantitative relaxation times from synthetic images allow better estimations of ischemic stroke onset time, consequently increasing confidence in synthetic MRIs as diagnostic tools for ischemic stroke.https://www.mdpi.com/2077-0383/9/6/1857brainmagnetic resonance imagingtechnologywhite matter |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Chia-Wei Li Ai-Ling Hsu Chi-Wen C. Huang Shih-Hung Yang Chien-Yuan Lin Charng-Chyi Shieh Wing P. Chan |
spellingShingle |
Chia-Wei Li Ai-Ling Hsu Chi-Wen C. Huang Shih-Hung Yang Chien-Yuan Lin Charng-Chyi Shieh Wing P. Chan Reliability of Synthetic Brain MRI for Assessment of Ischemic Stroke with Phantom Validation of a Relaxation Time Determination Method Journal of Clinical Medicine brain magnetic resonance imaging technology white matter |
author_facet |
Chia-Wei Li Ai-Ling Hsu Chi-Wen C. Huang Shih-Hung Yang Chien-Yuan Lin Charng-Chyi Shieh Wing P. Chan |
author_sort |
Chia-Wei Li |
title |
Reliability of Synthetic Brain MRI for Assessment of Ischemic Stroke with Phantom Validation of a Relaxation Time Determination Method |
title_short |
Reliability of Synthetic Brain MRI for Assessment of Ischemic Stroke with Phantom Validation of a Relaxation Time Determination Method |
title_full |
Reliability of Synthetic Brain MRI for Assessment of Ischemic Stroke with Phantom Validation of a Relaxation Time Determination Method |
title_fullStr |
Reliability of Synthetic Brain MRI for Assessment of Ischemic Stroke with Phantom Validation of a Relaxation Time Determination Method |
title_full_unstemmed |
Reliability of Synthetic Brain MRI for Assessment of Ischemic Stroke with Phantom Validation of a Relaxation Time Determination Method |
title_sort |
reliability of synthetic brain mri for assessment of ischemic stroke with phantom validation of a relaxation time determination method |
publisher |
MDPI AG |
series |
Journal of Clinical Medicine |
issn |
2077-0383 |
publishDate |
2020-06-01 |
description |
The reliability of relaxation time measures in synthetic magnetic resonance images (MRIs) of homemade phantoms were validated, and the diagnostic suitability of synthetic imaging was compared to that of conventional MRIs for detecting ischemic lesions. Phantoms filled with aqueous cupric-sulfate (CuSO<sub>4</sub>) were designed to mimic spin-lattice (T<sub>1</sub>) and spin-spin (T<sub>2</sub>) relaxation properties and were used to compare their accuracies and stabilities between synthetic and conventional scans of various brain tissues. To validate the accuracy of synthetic imaging in ischemic stroke diagnoses, the synthetic and clinical scans of 18 patients with ischemic stroke were compared, and the quantitative contrast-to-noise ratios (CNRs) were measured, using the Friedman test to determine significance in differences. Results using the phantoms showed no significant differences in the interday and intersession synthetic quantitative T<sub>1</sub> and T<sub>2</sub> values. However, between synthetic and referenced T<sub>1</sub> and T<sub>2</sub> values, differences were larger for longer relaxation times, showing that image intensities in synthetic scans are relatively inaccurate in the cerebrospinal fluid (CSF). Similarly, CNRs in CSF regions of stroke patients were significantly different on synthetic T<sub>2</sub>-weighted and T<sub>2</sub>-fluid-attenuated inversion recovery images. In contrast, differences in stroke lesions were insignificant between the two. Therefore, interday and intersession synthetic T<sub>1</sub> and T<sub>2</sub> values are highly reliable, and discrepancies in synthetic T<sub>1</sub> and T<sub>2</sub> relaxation times and image contrasts in CSF regions do not affect stroke lesion diagnoses. Additionally, quantitative relaxation times from synthetic images allow better estimations of ischemic stroke onset time, consequently increasing confidence in synthetic MRIs as diagnostic tools for ischemic stroke. |
topic |
brain magnetic resonance imaging technology white matter |
url |
https://www.mdpi.com/2077-0383/9/6/1857 |
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