[Wiener spectrum and relative electron density resolution in heavy ion CT based on measurement of residual range distribution].
The relative electron density resolution was discussed by the Wiener spectrum in the heavy ion CT image. The two-dimensional (2D) Wiener spectrum in the CT image was obtained from the one-dimensional (1D) Wiener spectrum of the measured residual range distribution of the water phantom for a single projection angle, and the relative electron density resolution in the CT image was calculated from the 2D Wiener spectrum. To examine the usefulness of this method, the relative electron density resolution was also estimated by other two methods; the calculation using the Wiener spectrum of the reconstructed image of the water phantom, and the estimation by the reconstructed image of the electron density resolution phantom. The result of the first method was similar to those of the other two methods. Therefore, it is useful to estimate the relative electron density resolution by the 1D Wiener spectrum of the measured residual range distribution of the water phantom for a single projection angle.
Yasuda
Naruomi
N
Graduate School of Health Sciences, Ibaraki Prefectural University of Health Sciences, 4669-2 Oaza-Ami Ami-machi Inashiki-gun, Ibaraki-ken, 300-0394, Japan. e3020013@ipu.ac.jp
Abe
Shinji
S
Nishimura
Katsuyuki
K
Sato
Hitoshi
H
Tomida
Tetsuya
T
Muraishi
Hiroshi
H
Kanzaki
Takayuki
T
Inada
Tetsuo
T
Yusa
Ken
K
Kanai
Tatsuaki
T
Kawachi
Kiyomitsu
K
D004583:Electrons; D020450:Heavy Ions; D007091:Image Processing, Computer-Assisted; D019047:Phantoms, Imaging; D014057:Tomography, X-Ray Computed