Masanari Hamazu

Shiga University of Medical Science

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K. Masuda

Nagoya University

Hideo Ohnishi

University of Occupational and Environmental Health Japan

Tatsuya Honda

Iwate Medical University

Tetsuo Kida

National Institute for Physiological Sciences

Yoshinori Ikemoto

National Maritime Research Institute

Mitsuru Komizu

Osaka University Hospital

Hideo Onishi

Morinomiya University of Medical Sciences

H. Sogabe

Hideto Honda

Shiga University of Medical Science Hospital

T. Miyagawa

Toshiba (Japan)

Cooperative Institutions

Shiga University of Medical Science

Shiga University of Medical Science Hospital

Osaka University

Nagoya University

The University of Tokyo

Osaka City University

Kyoto University Hospital

Kindai University

National Institutes for Quantum and Radiological Science and Technology

Nagoya Institute of Technology

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238. Quantitative assessment of image quality in myocardial SPECT (1st report)

Japanese Journal of Radiological Technology (1993)

N. Ushio M. Takahashi Hideo Ohnishi Masanari Hamazu K. Masuda

Quality Assessment

10.6009/jjrt.kj00003324826

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383. Image processing with Network system for Radionuclide Image

Japanese Journal of Radiological Technology (1990)

Hideo Onishi Masafumi Takahashi Masanari Hamazu K. Masuda Shuichi Sogabe

10.6009/jjrt.kj00003322505

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Examination of Attenuation Correction Using Low-dose Computed Tomography

Japanese Journal of Radiological Technology (2006)

Harumi Iguchi Tetsuo Kida Kazuo Noma Masahiro Yoshimura Masanari Hamazu

Attenuation correction is necessary for the reconstruction of SPECT images. One report has mentioned that attenuation correction by X-ray computed tomography (CT) is effective for a non-uniform attenuation body. We examined the effect of attenuation correction on SPECT images by changing the scanning conditions of CT, and evaluated the possibility of attenuation correction by low-dose CT. The phantom was scanned under several X-ray tube conditions varying from 80 kV to 135 kV and from 7.5 mAs to 200 mAs. We obtained equations of attenuation correction based on the Hounsfield Unit (HU) units of each pixel and compared the effects of attenuation correction. The results showed that the equation for attenuation correction under each condition did not vary significantly, and the effects of attenuation correction by the equations did not vary significantly between CT of low dose and that of clinical dose. This result suggest that the attenuation correction obtained by low-dose CT was equal to that obtained by the clinical dose. In conclusion, it seemed that the equation and map of attenuation correction matched with each radionuclide yielded more adequate attenuation correction than conventional methods.

Correction for attenuation

Hounsfield scale

10.6009/jjrt.62.840

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Citations (3)

Respiration-gated Chest Ct

Japanese Journal of Radiological Technology (1997)

Tatsuya Honda Masanari Hamazu Masahiro Yoshimura Tetsuo Kida Isao Nakayama

10.6009/jjrt.kj00001355089

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229. Evaluation of SPECT smoothing filters for the measurement of myocardial thickness

Japanese Journal of Radiological Technology (1991)

Mizuki Takahashi Hideo Onishi Masanari Hamazu K. Masuda H. Sogabe

Smoothing

10.6009/jjrt.kj00003323971

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Influence of the heart with the First CT image

Japanese Journal of Radiological Technology (1996)

Tatsuya Honda Masanari Hamazu

10.6009/jjrt.kj00001353855

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A measurement of patient exposure dose and scatter dose with UFCT

Japanese Journal of Radiological Technology (1996)

Eriko Honda Toshiyuki Kida M. Yosimura K. Hasimoto Masanari Hamazu

定 Ameasurement ot patient exposure dose

10.6009/jjrt.kj00001354047

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208. Evaluation of Aerosol spect Image

Japanese Journal of Radiological Technology (1990)

K. Masuda Hideo Ohnishi Mizuki Takahashi Masanari Hamazu H. Sogabe

10.6009/jjrt.kj00003322333

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2. ABILITY EVALUATION AND IMAGING OF A SCINTI-CAMERA (41th Annual Meeting)

Japanese Journal of Radiological Technology (1985)

K. Masuda Yoshinori Ikemoto Tatsuya Honda Masanari Hamazu Hideo Ohnishi

Following 4 items were investigated for standardization of the ability and imaging of the scinti-camera. (1) the historical background of the ability-improvement with the analog type scinti-camera and the digital type scinti-camera with the correction system. (2) the evaluation of uniformity of the analog type scinti-camera. (3) the paramaters (LSF, MTF) which has much influence on the measurement of the scinti-camera resolution. (4) the sensitivity of the collimator and the evaluation of the noise. Result : the historical background of the scinti-camera suggested the necessity of establishing a standard for the ability evaluation of the digital type scinti-camera. (1) It is necessary to study further the characteristics of the single and multi-energy spectrums, and to establish new standards for uninformity evalution, in addition to the NEMA and the JRT standard. (2) Sampling theory plays a great role in the evaluation of the resolution measurement, because it is influenced by the sampling interval and the peak counts of LSF. (3) finally, With regard to the collimator-sensitivity and the noise evaluation, it is necessary to evaluate the noise by the wiener-spectrum method in addition to the FWHM and MTF methods. (4)

Collimator

Digital camera

10.6009/jjrt.kj00001372337

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Ability evaluation and imaging of a scinti-camera

Japanese Journal of Radiological Technology (1985)

K. Masuda Yoshinori Ikemoto Tatsuya Honda Masanari Hamazu Hideo Ohnishi

Source

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