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

Numerical simulations of the thermoa...

Kiser, William Lester, Jr.

FindBook

Google Book

Amazon

博客來

Numerical simulations of the thermoacoustic computed tomography breast imaging system.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Numerical simulations of the thermoacoustic computed tomography breast imaging system./
作者:	Kiser, William Lester, Jr.
面頁冊數:	137 p.
附註:	Source: Dissertation Abstracts International, Volume: 60-11, Section: B, page: 5469.
Contained By:	Dissertation Abstracts International60-11B.
標題:	Health Sciences, Radiology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9951974
ISBN:	9780599537415

Numerical simulations of the thermoacoustic computed tomography breast imaging system.
Kiser, William Lester, Jr.

Numerical simulations of the thermoacoustic computed tomography breast imaging system. - 137 p.

Source: Dissertation Abstracts International, Volume: 60-11, Section: B, page: 5469.

Thesis (Ph.D.)--Purdue University, 1999.

A thermoacoustic wave is produced when an object absorbs energy and experiences a subsequent thermal expansion. We have developed a Thermoacoustic Computed Tomography (TACT) breast imaging system to exploit the thermoacoustic phenomena as a method of soft tissue imaging. By exposing the breast to short pulses of 434 MHz microwaves, ultrasonic pulses are generated and detected with a hemispherical transducer array submersed in a water bath. Filtering and back projecting the transducer signals generates a 3-D image that maps the localized microwave absorption properties of the breast. In an effort to understand the factors limiting image quality, the TACT system was numerically simulated. The simulations were used to generate the transducer signals that would be collected by the TACT system during a scan of an object. These simulated data streams were then fed into the system image reconstruction software to provide images of simulated phantoms. The effects of transducer diameter, transducer response, transducer array geometry and stimulating pulse width on the spatial and contrast resolution of the system were quantified using the simulations. The spatial resolution was highly dependent upon location in the imaging volume. This was due to the off axis response of transducers of finite aperture. Simulated data were compared with experimental data, obtained by imaging a parallel-piped resolution phantom, to verify the accuracy of the simulation code. A contrast-detail phantom was numerically simulated to determine the ability of the system to image spheres of diameters <1 cm with absorption values on the order of physiologic saline, when located in a background of noise. The results of the contrast-detail analysis were dependent on the location of the spheres in the imaging volume and the diameter of the simulated transducers. This work sets the foundation for the initial image quality studies of the TACT system. Improvements to the current imaging system, based on the results of the study, are suggested.

ISBN: 9780599537415Subjects--Topical Terms:

1019076
Health Sciences, Radiology.

Numerical simulations of the thermoacoustic computed tomography breast imaging system.
LDR:03017nmm 2200301 4500 001 1829800
005 20070313104724.5
008 130610s1999 eng d
020 $a 9780599537415
035 $a (UnM)AAI9951974
035 $a AAI9951974
040 $a UnM $c UnM
100 1 $a Kiser, William Lester, Jr. $3 1918651
245 1 0 $a Numerical simulations of the thermoacoustic computed tomography breast imaging system.
300 $a 137 p.
500 $a Source: Dissertation Abstracts International, Volume: 60-11, Section: B, page: 5469.
500 $a Co-Major Professors: Robert A. Kruger; Yun Liang.
502 $a Thesis (Ph.D.)--Purdue University, 1999.
520 $a A thermoacoustic wave is produced when an object absorbs energy and experiences a subsequent thermal expansion. We have developed a Thermoacoustic Computed Tomography (TACT) breast imaging system to exploit the thermoacoustic phenomena as a method of soft tissue imaging. By exposing the breast to short pulses of 434 MHz microwaves, ultrasonic pulses are generated and detected with a hemispherical transducer array submersed in a water bath. Filtering and back projecting the transducer signals generates a 3-D image that maps the localized microwave absorption properties of the breast. In an effort to understand the factors limiting image quality, the TACT system was numerically simulated. The simulations were used to generate the transducer signals that would be collected by the TACT system during a scan of an object. These simulated data streams were then fed into the system image reconstruction software to provide images of simulated phantoms. The effects of transducer diameter, transducer response, transducer array geometry and stimulating pulse width on the spatial and contrast resolution of the system were quantified using the simulations. The spatial resolution was highly dependent upon location in the imaging volume. This was due to the off axis response of transducers of finite aperture. Simulated data were compared with experimental data, obtained by imaging a parallel-piped resolution phantom, to verify the accuracy of the simulation code. A contrast-detail phantom was numerically simulated to determine the ability of the system to image spheres of diameters <1 cm with absorption values on the order of physiologic saline, when located in a background of noise. The results of the contrast-detail analysis were dependent on the location of the spheres in the imaging volume and the diameter of the simulated transducers. This work sets the foundation for the initial image quality studies of the TACT system. Improvements to the current imaging system, based on the results of the study, are suggested.
590 $a School code: 0183.
650 4 $a Health Sciences, Radiology. $3 1019076
650 4 $a Physics, Acoustics. $3 1019086
650 4 $a Engineering, Electronics and Electrical. $3 626636
690 $a 0574
690 $a 0986
690 $a 0544
710 2 0 $a Purdue University. $3 1017663
773 0 $t Dissertation Abstracts International $g 60-11B.
790 1 0 $a Kruger, Robert A., $e advisor
790 1 0 $a Liang, Yun, $e advisor
790 $a 0183
791 $a Ph.D.
792 $a 1999
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9951974