Quality assurance system for radiation therapy equipment, and quality assurance method thereof
A quality assurance system for radiation therapy equipment includes an image capturing unit installed on radiation therapy equipment and capturing an image of an indicating part indicating an operational state of the radiation therapy equipment, an image processing unit extracting an edge of the indicating part in image captured by the image capturing unit, a center point extraction unit extracting a center point with respect to the edge, and a quality evaluation unit evaluating quality of the radiation therapy equipment by tracking movement of the center point.
1. A quality assurance system for radiation therapy equipment, the system comprising:
a main body portion;
a gantry coupled to one side of the main body portion and capable of rotating in at least one direction with respect to the main body portion;
a radiation emitting gantry head formed at one side of the gantry and emitting radiation;
a couch arranged at one side of the main body portion and capable of moving in at least one direction with respect to the main body portion;
an image capturing unit arranged adjacent to at least one of the gantry, and the radiation emitting gantry head and capturing at least one image generated based on the light exposed from the radiation emitting gantry head;
an image center point tracking device configured to perform pattern matching on the captured image, wherein the pattern matching comprises extracting a center point of each captured image and determining a position change of the center point;
an image analyzing device configured to evaluate quality of the radiation therapy equipment based on tracking movement of the center point; and
an indicating part indicating a mechanical isocenter point of the radiation therapy equipment;
wherein the image capturing unit captures images of the indicating part.
2. The system of claim 1 , wherein the image capturing unit continuously captures an image based on light that is exposed from the radiation emitting gantry head while at least one of the gantry, the radiation emitting gantry head, and the couch rotates, and
the image center point tracking device extracts a center point of the light with respect to each of consecutive frames of images.
3. The system of claim 1 , further comprising a light field accuracy determination unit that determines a degree of accuracy regarding a size of an light field by analyzing the captured image.
4. The system of claim 3 , wherein the light field accuracy determination unit calculates a full width at half maximum (FWHM) with respect to a captured light field image and sets the calculated FWHM as an light field width.
5. The system of claim 1 , wherein the indicating part is installed on the couch, and
the image center point tracking device extracts, an area having a pattern that is most similar to the predefined pattern of the indicating part from the captured image.
6. The system of claim 1 , wherein the image analyzing device calculates a size of a rotation center of a light field of the radiation emitting gantry head by analyzing the captured image and determines a degree of accuracy of the rotation center.
7. The system of claim 1 , wherein the image center point tracking device determines a degree of accuracy of movement of the couch based on the captured image.