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Rapid magnetic resonance imaging.

Meyer, Craig Howard.

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Rapid magnetic resonance imaging.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Rapid magnetic resonance imaging./
作者:	Meyer, Craig Howard.
面頁冊數:	157 p.
附註:	Adviser: Albert Macovski.
Contained By:	Dissertation Abstracts International62-01B.
標題:	Biophysics, Medical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3000067
ISBN:	0493087761

Rapid magnetic resonance imaging.
Meyer, Craig Howard.

Rapid magnetic resonance imaging. - 157 p.

Adviser: Albert Macovski.

Thesis (Ph.D.)--Stanford University, 2001.

Magnetic resonance imaging (MRI) is now a valuable tool for medical diagnosis. However, physiological motion limits the usefulness of MRI in many areas of the body, including the heart and the abdomen. This dissertation describes a set of techniques for speeding up MRI scans. These techniques have greatly improved the visualization of areas of the body that were difficult to image with conventional techniques.

ISBN: 0493087761Subjects--Topical Terms:

1017681
Biophysics, Medical.

Rapid magnetic resonance imaging.
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100 1 $a Meyer, Craig Howard. $3 1256007
245 1 0 $a Rapid magnetic resonance imaging.
300 $a 157 p.
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500 $a Source: Dissertation Abstracts International, Volume: 62-01, Section: B, page: 0434.
502 $a Thesis (Ph.D.)--Stanford University, 2001.
520 $a Magnetic resonance imaging (MRI) is now a valuable tool for medical diagnosis. However, physiological motion limits the usefulness of MRI in many areas of the body, including the heart and the abdomen. This dissertation describes a set of techniques for speeding up MRI scans. These techniques have greatly improved the visualization of areas of the body that were difficult to image with conventional techniques.
520 $a The core technique described is spiral <italic>k</italic>-space scanning. This technique rapidly scans a spiral path in <italic>k</italic>-space, allowing more data to be acquired during a single acquisition. The advantages of spiral scanning include excellent efficiency and good resistance to image artifacts from flowing blood, and the disadvantages include image blurring from main field inhomogeneity. Developing spiral scanning required a number of technical advances, including image reconstruction techniques and gradient waveform design techniques. An important offshoot was the development of spectral-spatial excitation pulses, which simultaneously select a section through the body and suppress unwanted material such as fat.
520 $a The techniques developed were applied to a variety of imaging problems. The first imaging problem described is rapid imaging of abdominal tumors. Because spin echoes are needed to provide the desired contrast for tumor imaging, an inward <italic>k</italic>-space spiral preceding the spin echo followed by an outward <italic>k</italic>-space spiral has a number of advantages. Breath-held images of patients with abdominal tumors are shown, and these images have reduced blurring and artifacts from respiratory motion.
520 $a The second imaging problem described is coronary artery imaging. A noninvasive way to detect coronary artery disease has long been a goal in medical imaging. Substantial progress toward this goal is an important contribution of this work. Spiral scanning provides high-resolution images of the coronary arteries that freeze the heart motion within a breath-hold. Initial patient studies show promise for detection of coronary blockages.
520 $a The final imaging problem described is coronary wall imaging. By nulling the blood within a coronary artery and the fat surrounding it, images of the coronary wall itself are obtained. These images are useful in their own right and also aid in the design of coronary artery imaging sequences.
590 $a School code: 0212.
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792 $a 2001
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