

Errors of the data obtained using Adobe Photoshop were significantly smaller than those of the data obtained from films on light boxes (p < 0.007). The errors, defined as the differences between the control data and the measurement data, were assessed. To obtain control data, lead balls were used as a fiducial point for matching the films accurately. Under the other condition, films were scanned into a computer and displayed using Adobe Photoshop, and examiners measured distances between the isocenter on simulation films and those on portal films by adjusting the bony structures. Under one condition, films were hanged on light boxes, and examiners measured distances between the isocenter on simulation films and that on portal films by adjusting the bony structures. We prepared the following two conditions for verification. The purpose of this study was to assess the accuracy of a geometrical verification system using Adobe Photoshop. It is possible to scan images and then view them simultaneously with this software. Ishiyama, Hiromichi Suzuki, Koji Niino, Keiji Hosoya, Takaaki Hayakawa, KazushigeĪdobe Photoshop is used worldwide and is useful for comparing portal films with simulation films. Geometrical verification system using Adobe Photoshop in radiotherapy.
