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Novel hardware methods in MRI.

Stanford University.

Novel hardware methods in MRI.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Novel hardware methods in MRI.
Author:	Venook, Ross Daniel.
Description:	95 p.
Notes:	Adviser: Albert Macovski.
Notes:	Source: Dissertation Abstracts International, Volume: 67-05, Section: B, page: 2762.
Contained By:	Dissertation Abstracts International67-05B.
Subject:	Engineering, Electronics and Electrical.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3219403
ISBN:	9780542708374

Novel hardware methods in MRI.
Venook, Ross Daniel.

Novel hardware methods in MRI. - 95 p.

Adviser: Albert Macovski.

Thesis (Ph.D.)--Stanford University, 2006.

Finally, we present new concepts for reducing and monitoring RF-induced heating of long conductive structures in the MRI environment. We develop two methods for reducing coupled power from an RF transmitter, and we present experimental evidence that these methods could offer an appropriate margin for safe MR guidance of surgical procedures. We also present an image-based technique for quantifying RF-induced guidewire currents during an interventional MRI procedure.

ISBN: 9780542708374Subjects--Topical Terms:

226981
Engineering, Electronics and Electrical.

Novel hardware methods in MRI.
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245 1 0 $a Novel hardware methods in MRI.
300 $a 95 p.
500 $a Adviser: Albert Macovski.
500 $a Source: Dissertation Abstracts International, Volume: 67-05, Section: B, page: 2762.
502 $a Thesis (Ph.D.)--Stanford University, 2006.
520 # $a Finally, we present new concepts for reducing and monitoring RF-induced heating of long conductive structures in the MRI environment. We develop two methods for reducing coupled power from an RF transmitter, and we present experimental evidence that these methods could offer an appropriate margin for safe MR guidance of surgical procedures. We also present an image-based technique for quantifying RF-induced guidewire currents during an interventional MRI procedure.
520 # $a First, we evaluate the ability of a Prepolarized MRI (PMRI) extremity scanner to image near metal orthopedic implants. We present a comparison study, between PMRI and a 1.5 T conventional system, that exhibits the substantial reduction in metal susceptibility artifacts under PMRI with only a modest trade-off in image quality. Our new artifact quantification method confirms that susceptibility artifacts improve as expected with decreasing readout field using PMRI. This proof-of-concept study demonstrates that prepolarized techniques can provide diagnostic cross-sectional images for post-operative evaluation of patients with metal implants, which is not possible using conventional MRI techniques.
520 # $a Magnetic Resonance Imaging (MRI) is a cross-sectional medical imaging modality that has become the standard of care for diagnosing soft-tissue pathologies ranging from stroke to meniscal tears. Conventional MRI involves expensive and proprietary scanners, discouraging hardware development; yet, such improvements often offer the best outlook for emerging applications. This work presents and evaluates several novel hardware approaches for improving MRI performance in specific applications.
520 # $a Second, we present automatic tuning hardware for interarticular RF receiver coils. Interventional coils must be flexible to be safe and effective. A changing receiver shape, in turn, suggests the need for dynamic tuning to maximize system signal-to-noise ratio. To address this, we built and demonstrated microcontroller-based circuitry for automatically tuning flexible RF receiver coils at the touch of a button. We present in vitro porcine knee model comparison studies that confirm the opportunity for interventional coils to greatly improve resolution in small field-of-view applications.
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