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Proceedings Paper

The CT image standardization based on the verified PSF
Author(s): Shinichi Wada; Masaki Ohkubo; Masayuki Kunii; Toru Matsumoto; Kohei Murao; Kazuo Awai; Mitsuru Ikeda
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Paper Abstract

This study discusses a method of CT image quality standardization that uses a point-spread function (PSF) in MDCT. CT image I(x,y,z) is represented by the following formula: I(x,y,z) = O(x,y,z)***PSF(x,y,z). Standardization was performed by measuring the three-dimensional (3-D) PSFs of two CT images with different image qualities. The image conversion method was constructed and tested using the 3-D PSFs and CT images of the CT scanners of three different manufacturers. The CT scanners used were Lightspeed QX/i, Somatom Volume Zoom, and Brilliance-40. To obtain the PSF(x,y) of these CT scanners, the line spread functions of the respective reconstruction kernels were measured using a phantom described by J.M. Boone. The kernels for each scanner were: soft, standard, lung, bone, and bone plus (GE); B20f, B40f, B41f, B50f, and B60f (Siemens); and B, C, D, E, and L (Philips). Slice sensitivity profile (SSP) were measured using a micro-disk phantom (50 μm* φ1 mm) with 5 mm slice thickness and beam pitch of 1.5 (GE, Siemens) and 0.626 (Philips). 3-D PSF was verified using an MDCT QA phantom. Real chest CT images were converted to images with contrasting standard image quality. Comparison between the converted CT image and the original standard image showed good agreement. The usefulness of the image conversion method is discussed using clinical CT images acquired by CT scanners produced by different manufacturers.

Paper Details

Date Published: 15 March 2007
PDF: 8 pages
Proc. SPIE 6510, Medical Imaging 2007: Physics of Medical Imaging, 65104D (15 March 2007); doi: 10.1117/12.708888
Show Author Affiliations
Shinichi Wada, Niigata Univ. (Japan)
Masaki Ohkubo, Niigata Univ. (Japan)
Masayuki Kunii, Niigata Univ. (Japan)
Toru Matsumoto, National Institute of Radiological Sciences (Japan)
Kohei Murao, Fujitsu, Ltd. (Japan)
Kazuo Awai, Kumamoto Univ. (Japan)
Mitsuru Ikeda, Nagoya Univ. (Japan)


Published in SPIE Proceedings Vol. 6510:
Medical Imaging 2007: Physics of Medical Imaging
Jiang Hsieh; Michael J. Flynn, Editor(s)

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