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Low Power Techniques for Wireless MRI Receiver Arrays.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Low Power Techniques for Wireless MRI Receiver Arrays./
作者:	Vassos, Christopher William.
面頁冊數:	1 online resource (122 pages)
附註:	Source: Dissertations Abstracts International, Volume: 84-05, Section: B.
Contained By:	Dissertations Abstracts International84-05B.
標題:	Receivers & amplifiers. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29755936click for full text (PQDT)
ISBN:	9798357501257

Low Power Techniques for Wireless MRI Receiver Arrays.
Vassos, Christopher William.

Low Power Techniques for Wireless MRI Receiver Arrays. - 1 online resource (122 pages)

Source: Dissertations Abstracts International, Volume: 84-05, Section: B.

Thesis (Ph.D.)--Stanford University, 2022.

Includes bibliographical references

A longtime goal of the MRI community has been the development of conformal wireless receiver arrays as an alternative to their bulky, rigid, and often uncomfortable standard implementations. Current MR receive channels require high power consumption to enable the stringent Noise Figure, Gain, and Dynamic Range necessary for clinically relevant data. Combined with high channel counts (32 to 96), power consumption is a major challenge when translating to the wireless use case. As the pre-amplifier is the receiver element that determines many performance metrics and can consume over 200mW it is a prime candidate for re-evaluation.In this work, I will present an alternative SiGe HBT based MRI pre-amplifier with power consumption up to 28x less than current HEMT-based devices. Its potential for integration is first evaluated through behavioral modeling alongside a real image dataset. Following initial simulated results, its impact on imaging performance is evaluated via benchtop evaluation with MR-relevant receiver components. Alongside this pre-amplifier I propose a semi-blind calibration and compensation framework that can be integrated into the existing pre-scan period for dynamic range expansion, as this amplifier features reduced linearity relative to MR standards. The application of this calibration method is able to reduce errors stemming from non-linear distortion to levels comparable to industry reference amplifiers.This is followed by preliminary work integrating this amplifier and calibration method into a 1.5T system demonstrating example calibration experiments and phantom images. The presented calibration method is applied to these images recovering image quality and illustrating the potential for the utility of the presented amplifier and calibration method. This concludes in a discussion regarding system level integration considerations for such a method in high-channel count arrays.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798357501257Subjects--Topical Terms:

3559205
Receivers & amplifiers.
Index Terms--Genre/Form:

542853
Electronic books.

Low Power Techniques for Wireless MRI Receiver Arrays.
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520 $a A longtime goal of the MRI community has been the development of conformal wireless receiver arrays as an alternative to their bulky, rigid, and often uncomfortable standard implementations. Current MR receive channels require high power consumption to enable the stringent Noise Figure, Gain, and Dynamic Range necessary for clinically relevant data. Combined with high channel counts (32 to 96), power consumption is a major challenge when translating to the wireless use case. As the pre-amplifier is the receiver element that determines many performance metrics and can consume over 200mW it is a prime candidate for re-evaluation.In this work, I will present an alternative SiGe HBT based MRI pre-amplifier with power consumption up to 28x less than current HEMT-based devices. Its potential for integration is first evaluated through behavioral modeling alongside a real image dataset. Following initial simulated results, its impact on imaging performance is evaluated via benchtop evaluation with MR-relevant receiver components. Alongside this pre-amplifier I propose a semi-blind calibration and compensation framework that can be integrated into the existing pre-scan period for dynamic range expansion, as this amplifier features reduced linearity relative to MR standards. The application of this calibration method is able to reduce errors stemming from non-linear distortion to levels comparable to industry reference amplifiers.This is followed by preliminary work integrating this amplifier and calibration method into a 1.5T system demonstrating example calibration experiments and phantom images. The presented calibration method is applied to these images recovering image quality and illustrating the potential for the utility of the presented amplifier and calibration method. This concludes in a discussion regarding system level integration considerations for such a method in high-channel count arrays.
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