Evaluation of image quality in terahertz pulsed imaging using test objects

被引:22
作者
Fitzgerald, AJ [1 ]
Berry, E
Miles, RE
Zinovev, NN
Smith, MA
Chamberlain, JM
机构
[1] Univ Leeds, Acad Unit Med Phys, Leeds LS1 3EX, W Yorkshire, England
[2] Univ Leeds, Ctr Med Imaging Res, Leeds LS1 3EX, W Yorkshire, England
[3] Univ Leeds, Inst Microwaves & Photon, Leeds LS2 9JT, W Yorkshire, England
关键词
D O I
10.1088/0031-9155/47/21/326
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
As with other imaging modalities, the performance of terahertz (THz) imaging systems is limited by factors of spatial resolution, contrast and noise. The purpose of this paper is to introduce test objects and image analysis methods to evaluate and compare THz image quality in a quantitative and objective way, so that alternative terahertz imaging system configurations and acquisition techniques can be compared, and the range of image parameters can be assessed. Two test objects were designed and manufactured, one to determine the modulation transfer functions (MTF) and the other to derive image signal to noise ratio (SNR) at a range of contrasts. As expected the higher THz frequencies had larger MTFs, and better spatial resolution as determined by the spatial frequency at which the MTF dropped below the 20% threshold. Image SNR was compared for time domain and frequency domain image parameters and time delay based images consistently demonstrated higher SNR than intensity based parameters such as relative transmittance because the latter are more strongly affected by the sources of noise in the THz system such as laser fluctuations and detector shot noise.
引用
收藏
页码:3865 / 3873
页数:9
相关论文
共 30 条
[1]  
Arnone D, 2000, PHYS WORLD, V13, P35
[2]   Preliminary experience with medical applications of rapid prototyping by selective laser sintering [J].
Berry, E ;
Brown, JM ;
Connell, M ;
Craven, CM ;
Efford, ND ;
Radjenovic, A ;
Smith, MA .
MEDICAL ENGINEERING & PHYSICS, 1997, 19 (01) :90-96
[3]  
Beutel J., 2000, HDB MED IMAGING
[4]  
BEZANT CD, 2000, THESIS U NOTTINGHAM
[5]  
Boreman G. D., 2001, Tutorial texts in optical engieering (SPIE)
[6]   Far-infrared foreign and self-broadened rotational linewidths of high-temperature water vapor [J].
Cheville, RA ;
Grischkowsky, D .
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, 1999, 16 (02) :317-322
[7]   FAR-INFRARED TERAHERTZ TIME-DOMAIN SPECTROSCOPY OF FLAMES [J].
CHEVILLE, RA ;
GRISCHKOWSKY, D .
OPTICS LETTERS, 1995, 20 (15) :1646-1648
[8]   Biomedical applications of Terahertz Pulse Imaging [J].
Ciesla, CM ;
Arnone, DD ;
Corchia, A ;
Crawley, D ;
Longbottom, C ;
Linfield, EH ;
Pepper, M .
COMMERCIAL AND BIOMEDICAL APPLICATIONS OF ULTRAFAST LASERS II, 2000, 3934 :73-81
[9]   Coupling and quality factors in RFID [J].
Cole, PH .
DESIGN, CHARACTERIZATION, AND PACKAGING FOR MEMS AND MICROELECTRONICS II, 2001, 4593 :1-11