Effects of frequency on image quality in terahertz-pulsed images

FITZGERALD, Anthony J., DZONTOH, Emmanuel, LOEFFLER, Torsten, SIEBERT, Karsten, BERRY, Elizabeth, ZINVOVIEV, Nick N., MILES, Robert E., SMITH, Michael A. and CHAMBERLAIN, Martyn (2002). Effects of frequency on image quality in terahertz-pulsed images. Proceedings of SPIE: Medical Imaging 2002: Physics of Medical Imaging, 4682, 107-116.

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Link to published version:: 10.1117/12.465548

Abstract

Terahertz imaging is an emerging modality, with potential for medical applications, using broadband sub-picosecond electromagnetic pulses in the range of frequencies between 100 GHz and 100 terahertz (THz). Images can be formed using parameters derived from the time domain, or at the range of frequencies in the Fourier domain. The choice of frequency at which to image may be an important factor for clinical applications. Image quality as a function of frequency was assessed for a terahertz pulsed imaging system by means of; (i) image noise measurements on a specially designed step wedge, and (ii) modulation transfer functions (MTF) derived from a range of spatial frequency square wave patterns. It was found that frequencies with larger signal magnitude gave lower image noise, measured using relative standard deviation (standard deviation divided by mean) for uniform regions of interest of the step wedge image. MTF results were as expected, with higher THz frequency signals demonstrating a consistently higher MTF and higher spatial frequency limiting resolution than the lower THz frequencies. There is a trade-off between image noise and spatial resolution with image frequency. Higher frequencies exhibit better spatial resolution than lower frequencies, however the decrease in signal power results in a degradation of the image.

Item Type: Article
Research Institute, Centre or Group: Centre for Health and Social Care Research
Identification Number: 10.1117/12.465548
Depositing User: Ann Betterton
Date Deposited: 16 Mar 2011 15:44
Last Modified: 16 Mar 2011 15:44
URI: http://shura.shu.ac.uk/id/eprint/3404

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