東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

FindBook

Google Book

Amazon

博客來

Optimizing a Radio-Frequency Coil for Pituitary Gland Imaging at 3 Tesla Magnetic Resonance Imaging.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Optimizing a Radio-Frequency Coil for Pituitary Gland Imaging at 3 Tesla Magnetic Resonance Imaging./
作者:	Ruan, Huaijin.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2022,
面頁冊數:	57 p.
附註:	Source: Masters Abstracts International, Volume: 84-01.
Contained By:	Masters Abstracts International84-01.
標題:	Electrical engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29252126
ISBN:	9798834011408

Optimizing a Radio-Frequency Coil for Pituitary Gland Imaging at 3 Tesla Magnetic Resonance Imaging.
Ruan, Huaijin.

Optimizing a Radio-Frequency Coil for Pituitary Gland Imaging at 3 Tesla Magnetic Resonance Imaging. - Ann Arbor : ProQuest Dissertations & Theses, 2022 - 57 p.

Source: Masters Abstracts International, Volume: 84-01.

Thesis (M.Engr.)--University of California, Los Angeles, 2022.

This item must not be sold to any third party vendors.

Magnetic resonance imaging (MRI) can serve as an efficient tool to examine the internal structure of the human body, especially for soft tissues. The pituitary gland-which regulates hormones in the body-is one example of soft tissue that can be investigated by MRI. One area of particular interest in the study of the pituitary gland is the search for miniature tumors, also called microadenomas. Microadenomas in the pituitary gland are important because they can cause Cushing's disease, which can cause death if untreated. However, although 60-80% of the pituitary adenomas are microadenomas, current 3 T MRI techniques cannot detect up to 50% of the microadenomas. The present work aims to increase detection accuracy by placing miniaturized MRI coils inside the sphenoid sinus (a hollow space or cavity near the pituitary gland), as close as possible to the region of interest (ROI), namely the pituitary gland. By placing MRI surface coils close to the target region, the SNR can be increased, which allows for improved detection accuracy of microadenomas that are too small for current scanning techniques. Previous studies using single-loop surface coils achieved high-SNR images, but in some cases, coils need to be rotated so that they can fit into the cavity near the pituitary gland. In the case of large rotation angles, single-loop surface coils are limited by the intrinsic "dead spot", especially when rotated 90 degrees. In contrast, figure 8-shaped surface coils are less effected by the signal loss due to coil plane rotations. In this study, we developed a custom-designed surface coil specifically for pituitary gland imaging. Parameters of the coil are optimized based on simulations, including the distance between the two semicircle-shaped components and the coil radius. A linear relationship between the optimal coil radius and target depth is established. The compensation between rotation angle of the coil plane and the horizontal shift of the target is also studied, proving that rotations have a reduced detrimental effect on coil performance as compared to single-loop coils, especially when the target is placed near the coil boundary.

ISBN: 9798834011408Subjects--Topical Terms:

649834
Electrical engineering.
Subjects--Index Terms:

MRI

Optimizing a Radio-Frequency Coil for Pituitary Gland Imaging at 3 Tesla Magnetic Resonance Imaging.
LDR:03184nmm a2200313 4500 001 2350152
005 20221020123909.5
008 241004s2022 ||||||||||||||||| ||eng d
020 $a 9798834011408
035 $a (MiAaPQ)AAI29252126
035 $a AAI29252126
040 $a MiAaPQ $c MiAaPQ
100 1 $a Ruan, Huaijin. $3 3689608
245 1 0 $a Optimizing a Radio-Frequency Coil for Pituitary Gland Imaging at 3 Tesla Magnetic Resonance Imaging.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2022
300 $a 57 p.
500 $a Source: Masters Abstracts International, Volume: 84-01.
500 $a Advisor: Candler, Robert N.
502 $a Thesis (M.Engr.)--University of California, Los Angeles, 2022.
506 $a This item must not be sold to any third party vendors.
520 $a Magnetic resonance imaging (MRI) can serve as an efficient tool to examine the internal structure of the human body, especially for soft tissues. The pituitary gland-which regulates hormones in the body-is one example of soft tissue that can be investigated by MRI. One area of particular interest in the study of the pituitary gland is the search for miniature tumors, also called microadenomas. Microadenomas in the pituitary gland are important because they can cause Cushing's disease, which can cause death if untreated. However, although 60-80% of the pituitary adenomas are microadenomas, current 3 T MRI techniques cannot detect up to 50% of the microadenomas. The present work aims to increase detection accuracy by placing miniaturized MRI coils inside the sphenoid sinus (a hollow space or cavity near the pituitary gland), as close as possible to the region of interest (ROI), namely the pituitary gland. By placing MRI surface coils close to the target region, the SNR can be increased, which allows for improved detection accuracy of microadenomas that are too small for current scanning techniques. Previous studies using single-loop surface coils achieved high-SNR images, but in some cases, coils need to be rotated so that they can fit into the cavity near the pituitary gland. In the case of large rotation angles, single-loop surface coils are limited by the intrinsic "dead spot", especially when rotated 90 degrees. In contrast, figure 8-shaped surface coils are less effected by the signal loss due to coil plane rotations. In this study, we developed a custom-designed surface coil specifically for pituitary gland imaging. Parameters of the coil are optimized based on simulations, including the distance between the two semicircle-shaped components and the coil radius. A linear relationship between the optimal coil radius and target depth is established. The compensation between rotation angle of the coil plane and the horizontal shift of the target is also studied, proving that rotations have a reduced detrimental effect on coil performance as compared to single-loop coils, especially when the target is placed near the coil boundary.
590 $a School code: 0031.
650 4 $a Electrical engineering. $3 649834
650 4 $a Medical imaging. $3 3172799
653 $a MRI
690 $a 0544
690 $a 0574
710 2 $a University of California, Los Angeles. $b Electrical Engineering 0303. $3 2092079
773 0 $t Masters Abstracts International $g 84-01.
790 $a 0031
791 $a M.Engr.
792 $a 2022
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29252126