Abstract: Similarities and volume ratios are calculated by a diseased-site contour data calculation unit, in such a manner that diseased-site contour data in data of a patient to be treated is compared with respective diseased-site contour data in a therapy plan database, using each of the centers in respective patient-body contour data, as a reference; and then similar cases are searched by an existing therapy-plan data search unit, based on the calculated similarities and the volume ratios, so that the case(s) with a high similarity is utilized as a similar case(s) for preparing a new therapy plan.

Abstract: A sub beam approximation step in which a particle beam is approximated by a collection of a plurality of sub beams having Gaussian distribution and a sub beam dose distribution calculation step in which by simulating the state in which each sub beam of a plurality of sub beams is deflected by a scanning device and travelled, each sub beam dose distribution which is formed inside a patient by each sub beam is calculated, and a dose distribution which is formed inside a patient by the particle beam is obtained by adding the each sub beam dose distribution which is calculated are comprised.

Abstract: A skin dose evaluation support apparatus is provided with a skin region contour creation unit that creates skin region information including the boundary coordinates of a skin region, based on image data to be inputted when a treatment plan for a radiation therapy for a patient is created; and a display calculation unit that extracts a skin dose in a skin region, based on dose distribution data calculated by a dose distribution calculation unit of a treatment planning apparatus and the skin region information, and creates display data for displaying the extracted skin dose in a predetermined display format.

Abstract: A skin dose evaluation support apparatus is provided with a skin region contour creation unit that creates skin region information including the boundary coordinates of a skin region, based on image data to be inputted when a treatment plan for a radiation therapy for a patient is created; and a display calculation unit that extracts a skin dose in a skin region, based on dose distribution data calculated by a dose distribution calculation unit of a treatment planning apparatus and the skin region information, and creates display data for displaying the extracted skin dose in a predetermined display format.

Abstract: In an audio and video recording apparatus, a video signal is separated into a luminance signal and a chrominance signal. The luminance signal is separated into low frequency and high frequency components. The high frequency component signal is subjected to balanced modulation to be thereafter band-compressed by interleaving the lower side band thereof to the low frequency component. The chrominance signal is processed to be a line sequential color difference signal. An audio signal is sampled and encoded. The luminance signal, the color difference signal and the audio signal are subjected to time-axis compression multiplexing in one frame with a synchronizing signal, address signals and control signals. The multiplex signal is recorded on a recording medium.