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BLADE imaging in the steady state (B...

Barkauskas, Kestutis J.

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BLADE imaging in the steady state (BLISS).

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	BLADE imaging in the steady state (BLISS)./
作者:	Barkauskas, Kestutis J.
面頁冊數:	152 p.
附註:	Adviser: Jeffrey L. Duerk.
Contained By:	Dissertation Abstracts International68-06B.
標題:	Engineering, Biomedical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3270638
ISBN:	9780549086680

BLADE imaging in the steady state (BLISS).
Barkauskas, Kestutis J.

BLADE imaging in the steady state (BLISS). - 152 p.

Adviser: Jeffrey L. Duerk.

Thesis (Ph.D.)--Case Western Reserve University, 2007.

Magnetic resonance imaging (MRI) achieves excellent soft tissue contrast and arbitrary scan plane selection without the use of ionizing radiation. Resolving small structures is the goal, but the imaging target may undergo physiological and bulk motion. Increased imaging speed can mitigate the effects arising from motion artifacts, yet for clinically available Cartesian pulse sequences, the required imaging trade-offs are diametrically opposed to achieving adequate resolution. BLADE (a.k.a. PROPELLER) is a technique that can address these competing objectives of MRI. Data is collected in strips, or "blades" of K-space; periodic rotation of the blade leads to oversampling of low spatial frequency components of the signal, which has been used to correct for rigid body motion across the series of blades.

ISBN: 9780549086680Subjects--Topical Terms:

1017684
Engineering, Biomedical.

BLADE imaging in the steady state (BLISS).
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502 $a Thesis (Ph.D.)--Case Western Reserve University, 2007.
520 $a Magnetic resonance imaging (MRI) achieves excellent soft tissue contrast and arbitrary scan plane selection without the use of ionizing radiation. Resolving small structures is the goal, but the imaging target may undergo physiological and bulk motion. Increased imaging speed can mitigate the effects arising from motion artifacts, yet for clinically available Cartesian pulse sequences, the required imaging trade-offs are diametrically opposed to achieving adequate resolution. BLADE (a.k.a. PROPELLER) is a technique that can address these competing objectives of MRI. Data is collected in strips, or "blades" of K-space; periodic rotation of the blade leads to oversampling of low spatial frequency components of the signal, which has been used to correct for rigid body motion across the series of blades.
520 $a To date, BLADE has predominantly been coupled with Turbo Spin Echo (TSE) acquisitions, whereas many rapid imaging techniques employ Steady State Free Precession (SSFP) to prepare the magnetization for signal collection. Variants of SSFP imaging offer speed, bright blood contrast and echo sharing capabilities. However, these SSFP approaches typically sacrifice quality to achieve imaging speed.
520 $a This work presents BLADE Imaging in the Steady State (BLISS). The BLADE framework provides self-correction opportunities for corrupted data, and SSFP avoids many of the pitfalls associated with TSE preparation, including SAR limitations and artifacts from T2-weighting across the blades. FLASH and TrueFISP variants of BLADE were developed and integrated into clinical imaging systems. Novel sampling density compensation was developed to minimize conventional gridding errors with the BLADE trajectory. Scan efficiency of BLADE was improved with parallel imaging, where the blades formed an entirely self-calibrating reference data set for GRAPPA reconstruction of undersampled data. An SNR analysis based on synthesized repetitions and bootstrap statistics was developed to characterize SNR loss between trajectories and image reconstruction methods. Simulated and in vivo temporal fidelity of contrast enhanced MR angiography was improved with a novel correction method for an existing technique that relies upon a vastly undersampled variant of the BLADE trajectory to regulate contributions from a temporally blurred composite image.
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