[Study of fast acquisition technique for heavy ion CT system based on the measurement of residual range distribution].
Igaku Butsuri
; 32(2): 58-66, 2012.
Article
en Ja
| MEDLINE
| ID: mdl-24592673
ABSTRACT
We proposed a new technique for the fast acquisition heavy ion CT (HICT) system based on the measurement of residual range distribution using an intensifying screen and charge coupled device camera. The previously used fast acquisition HICT system had poor electron density resolution. In the new technique, the range shifter thickness is varied over the required dynamic range in the spill of the heavy ion beam at each projection angle and the residual range distribution is determined by a series of acquisition data. We examined the image quality using the contrast noise ratio and the noise power spectrum, and estimated the electron density resolution, using a low-contrast phantom for measurement of electron density resolution. The image quality of the new technique was superior to that of the previous fast acquisition HICT system. Furthermore, the relative electron density resolution was 0.011, which represented an improvement of about 12-fold. Therefore we showed that the new technique was potentially useful in clinical use of HICT, including treatment and quality assurance of heavy ion therapy.
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Bases de datos:
MEDLINE
Asunto principal:
Dosis de Radiación
/
Procesamiento de Imagen Asistido por Computador
/
Planificación de la Radioterapia Asistida por Computador
/
Tomografía Computarizada por Rayos X
/
Iones Pesados
/
Radioterapia de Iones Pesados
Idioma:
Ja
Revista:
Igaku Butsuri
Asunto de la revista:
BIOFISICA
Año:
2012
Tipo del documento:
Article
País de afiliación:
Japón