Clinical evaluation of time-of-flight MR angiography with sparse undersampling and iterative reconstruction for cerebral aneurysms

被引:22
作者
Fushimi, Yasutaka [1 ]
Okada, Tomohisa [2 ]
Kikuchi, Takayuki [3 ]
Yamamoto, Akira [1 ]
Okada, Tsutomu [1 ]
Yamamoto, Takayuki [1 ]
Schmidt, Michaela [4 ]
Yoshida, Kazumichi [3 ]
Miyamoto, Susumu [3 ]
Togashi, Kaori [1 ]
机构
[1] Kyoto Univ, Grad Sch Med, Dept Diagnost Imaging & Nucl Med, 54 Shogoin Kawaharacho, Kyoto 6068507, Japan
[2] Kyoto Univ, Grad Sch Med, Human Brain Res Ctr, Sakyo Ku, 54 Shogoin Kawaharacho, Kyoto, Japan
[3] Kyoto Univ, Grad Sch Med, Dept Neurosurg, Sakyo Ku, 54 Shogoin Kawaharacho, Kyoto, Japan
[4] Siemens Healthcare GmbH, Diagnost Imaging, Erlangen, Germany
关键词
cerebral aneurysm; compressed sensing; parallel imaging; time-of-flight MR angiography; MAGNETIC-RESONANCE ANGIOGRAPHY; COMPRESSED SENSING RECONSTRUCTION; ACQUISITION;
D O I
10.1002/nbm.3774
中图分类号
Q6 [生物物理学];
学科分类号
071011 ;
摘要
Compressed sensing (CS) MRI has just been introduced to research areas as an innovative approach to accelerate MRI. CS is expected to achieve higher k-space undersampling by exploiting the underlying sparsity in an appropriate transform domain. MR angiography (MRA) provides high spatial resolution information on arteries; however, a relatively long acquisition time is necessary to cover a wide volume. Reduction of acquisition time by CS for time-of-flight (TOF) MR angiography (Sparse-TOF) is beneficial in clinical examinations; therefore, the clinical validity of Sparse-TOF needs to be investigated. The aim of this study was to compare the diagnostic capability of TOF MRA between parallel imaging (PI)-TOF with an acceleration factor of 3 (annotated as 3x) and Sparse-TOF (3x and 5x) in patients with cerebral aneurysms. PI-TOF (3x) and Sparse-TOF (3x and 5x) imaging were performed in 20 patients using a 3 T MRI system. Aneurysms in PI-TOF (3x) and Sparse-TOF (3x and 5x) were blindly rated as visible or scarcely visible by neuroradiologists. The neck, height and width of aneurysms were also measured. Twenty-six aneurysms were visualized and rated as visible in PI-TOF (3x) and Sparse-TOF (3x and 5x), with excellent agreement between two raters. No significant differences were found in measured neck, height or width of aneurysms among them. Sparse-TOF (3x and 5x) were acquired and reconstructed within 6 min, and cerebral aneurysms were visible in both of them with equivalent quality to PI-TOF (3x). Sparse-TOF (5x) is a good alternative to PI-TOF (3x) to visualize cerebral aneurysms.
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页数:9
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