| 摘要 |
<p>The test-object (1) has a flat and thin body (2) and an aligning unit i.e. continuous line (3), spaced from a ball (5) such that orthogonal projections of the aligning unit and the ball are separated by a predetermined distance, in a plane of a base surface of the body, where the ball has diameter of 2 mm. Thickness of the body in its detecting zone detecting a limit of a radiation beam emitted by a radiotherapy treating apparatus is less than thickness of the body in its element bearing zone. The body is made of thermoplastic polymer. An independent claim is also included for a method for controlling quality of a radiotherapy treating apparatus.</p> |
