Zobrazeno 1 - 10
of 10
pro vyhledávání: '"Masahiro Endo"'
Autor:
Shinichiro Mori, Masahiro Endo, Masayuki Baba, Hiroshi Asakura, Gregory C. Sharp, Susumu Kandatsu, Motoki Kumagai
Publikováno v:
Physics in Medicine and Biology. 54(10):3231-3246
Purpose: When CT data with a thick slice thickness are used in treatment planning, geometrical uncertainty may induce dosimetric errors. We evaluated carbon ion dose variations due to different CT slice thicknesses using a four-dimensional (4D) carbo
Publikováno v:
Physics in Medicine and Biology. 52(4):1027-1038
The concept of internal target volume (ITV) is highly significant in radiotherapy for the lung, an organ which is hampered by organ motion. To date, different methods to obtain the ITV have been published and are therefore available. To define ITV, w
Autor:
Shinichiro Mori, Shuhei Komatsu, Susumu Kandatsu, Masayuki Baba, Masahiro Endo, Tomoyasu Yashiro
Publikováno v:
Physics in Medicine and Biology. 51(16):3953-3965
The combination-weighted Feldkamp algorithm (CW-FDK) was developed and tested in a phantom in order to reduce cone-beam artefacts and enhance cranio-caudal reconstruction coverage in an attempt to improve image quality when utilizing cone-beam comput
Autor:
Kanae Nishizawa, Yasuo Saito, Shinichiro Mori, Hiroaki Miyazaki, Mari Ohno, Kazuhiko Tsujita, Masahiro Endo
Publikováno v:
Physics in Medicine and Biology. 50:N359-N370
The prototype cone-beam CT (CBCT) has a larger beam width than the conventional multi-detector row CT (MDCT). This causes a non-uniform angular distribution of the x-ray beam intensity known as the heel effect. Scan conditions for CBCT tube current a
Autor:
Takanori Tsunoo, Masami Torikoshi, Yumiko Ohno, Naoto Yagi, Kazuyuki Hyodo, Yutaka Noda, Toshiyuki Kohno, Masahiro Endo, Kentaro Uesugi, M. Sasaki
Publikováno v:
Physics in Medicine and Biology. 48:673-685
Monochromatic x-ray computed tomography (CT) at two different energies provides information about electron density of human tissue without ambiguity due to the beam hardening effect. This information makes the treatment planning for proton and heavy-
Publikováno v:
Physics in medicine and biology. 51(20)
Purpose: Respiratory-gated CT (RGCT) and four-dimensional CT (4DCT) scan techniques cover consecutive segments of the respiratory cycle. However, motion artifacts may occur in fast respiratory phases such as mid-inhalation and -exhalation. CT imaging
Publikováno v:
Physics in medicine and biology. 51(3)
Although slow-rotation CT scanning (slow-scan CT: SSCT) has been used for radiation therapy planning, based on the rationale that average duration of the human respiratory cycle is 4 s, a number of physical and quantitative questions require answerin
Autor:
Manabu, Mizota, Tatsuaki, Kanai, Ken, Yusa, Takashi, Akagi, Munefumi, Shimbo, Haruo, Yamashita, Yasuyuki, Futami, Masahiro, Endo
Publikováno v:
Physics in medicine and biology. 47(6)
From the standpoint of quality assurance in radiotherapy, it is very important to compare the dose distributions realized by an irradiation system with the distribution planned by a treatment planning system. To compare the two dose distributions, it
Autor:
Tatsuaki Kanai, Hiromi Tomura, Yasuyuki Futami, Shinichi Minohara, Naruhiro Matsufuji, Masahiro Endo, Haruo Yamashita, Akio Higashi
Publikováno v:
Physics in medicine and biology. 43(11)
The precise conversion of CT numbers to their electron densities is essential in treatment planning for hadron therapy. Although some conversion methods have already been proposed, it is hard to check the conversion accuracy during practical therapy.
Autor:
Y Murakami, T A Iinuma, M Oshima, H Tsunemoto, F Shishido, Y Kutsutani-Nakamura, M Inoue, Masahiro Endo
Publikováno v:
Physics in medicine and biology. 27(2)
If treatment planning is done using the CT scanner's computer immediately the images are produced and before the patient's position is changed, then what is required is a mechanism to transfer back to the patient the resulting beam positioning inform