20 April 2005 Measurements and precisions of point spread function of multislice CT
Author Affiliations +
Proceedings Volume 5745, Medical Imaging 2005: Physics of Medical Imaging; (2005); doi: 10.1117/12.596683
Event: Medical Imaging, 2005, San Diego, California, United States
The determination of point spread function ( PSF ) is essential for the assessment of the performance of multi-slice CT corresponding to particular scanning or reconstruction condition. We studied the accuracy of the method for determination of PSF. The precision were evaluated with use of special made phantom and computer simulations. The PSF of some kinds of multi-slice CT were evaluated under the several scanning or reconstruction conditions. The performances were compared with each other and discussed. The PSF ( x, y, z ) was measured with separate components of PSF ( x, y ) and LSF (z). In the measurement of PSF ( x, y ) and LSF (z), we used Boone phantom and delta phantom respectively. The PSF ( x, y ) was calculated from LSF (x) and LSF (y). The LSF ( z ) obtained from deltal phantom was added for the calculation of PSF ( x, y, z ) with use of the following formula. PSF ( x, y, z ) = PSF ( x, y ) • LSF ( Z ) = LSF ( x ) • LSF ( y ) • LSF ( z ). The precision of the obtained LSF and PSF were evaluated by phantom experiment with computer simulation using following equations. I ( x ) = LSF ( x ) * O ( x ). [equation]. The precision of the measured PSF ( x, y ) was evaluated to be a good approximation for the image of the blood-vessel phantom. The results propose the method for the evaluation of the precision of measured point spread function. At the same time this results suggests the method of the calculation of the CT image affected by spatial resolution.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Shinichi Wada, Masaki Ohkubo, Toru Matsumoto, "Measurements and precisions of point spread function of multislice CT", Proc. SPIE 5745, Medical Imaging 2005: Physics of Medical Imaging, (20 April 2005); doi: 10.1117/12.596683; https://doi.org/10.1117/12.596683

Point spread functions

Computed tomography

Computer simulations

Spatial resolution

Precision measurement

3D image processing

Medical imaging


Thermoacoustic CT: imaging principles
Proceedings of SPIE (May 19 2000)
Reconstruction technique for focal spot wobbling
Proceedings of SPIE (June 01 1992)
Computed Tomography
Proceedings of SPIE (December 26 1979)

Back to Top