PMID: 16639396Apr 28, 2006Paper

Evaluation of low contrast resolution in cone beam CT using FPD

Nihon Hoshasen Gijutsu Gakkai zasshi
Kiyoshi SakamotoNorio Nakao

Abstract

We examined the low contrast resolution of cone beam CT (CBCT) equipped with an indirect-type flat panel detector and compared it with a commercial CT unit (Robusto) . In CBCT, the X-ray tube voltage of 110 kV was used, and in the Robusto, the usual 120 kV was used for examinations. The computed tomography dose index (CTDI) of the two systems was measured, and images scanned at about the same exposure to radiation were compared. The modulation transfer factors of the two systems were measured, and the convolution kernel that was the nearest to the characteristic of CBCT was chosen among kernels of the Robusto. A water phantom with a diameter of 200 mm was scanned, Wiener spectra were calculated, and signal-to-noise ratios were compared. The low contrast resolution phantom was scanned, and detectability and contrast-to-noise ratio (CNR) were measured. In addition, we placed diluted contrast medium into a phantom, scanned the phantom, and measured the detectability and CNR. When the X-ray irradiation condition of CBCT was 75 mAs at 110 kV, the equal dose of radioactivity in the Robusto was 50 mAs at 120 kV. In the low contrast resolution phantom, detectability was 8.7%mm in CBCT, and 9.4%mm in the Robusto. In the low contrast res...Continue Reading

References

Mar 29, 2002·Computerized Medical Imaging and Graphics : the Official Journal of the Computerized Medical Imaging Society·Rika BabaShigeyuki Ikeda
Feb 25, 2003·Nihon Hoshasen Gijutsu Gakkai zasshi·Katsuhiro Ichikawa
Feb 25, 2003·Nihon Hoshasen Gijutsu Gakkai zasshi·Toshiaki Miyati
Jul 29, 2005·Nihon Hoshasen Gijutsu Gakkai zasshi·Takanori HaraMasatoshi Tsuzaka

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Citations

Jul 16, 2009·Nihon Hoshasen Gijutsu Gakkai zasshi·Tadashi TakaseYasuo Nakazawa
Nov 23, 2011·Nihon Hoshasen Gijutsu Gakkai zasshi·Tsutomu Gomi
Feb 21, 2014·Japanese Journal of Radiology·Seiki HosokawaTetsuo Sonomura
Sep 22, 2017·Nihon Hoshasen Gijutsu Gakkai zasshi·Mitsuru OsawaHiroshi Miura

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