Abstract
Accurate knowledge of gantry angle is essential in megavoltage cone beam imaging (MVCBI) with an electronic portal imager. We present a method for determining the gantry angle by detecting multileaf collimator (MLC) leaf positions in projection images. During image acquisition the gantry moves continuously and the MLC operates in dynamic arc mode. Our algorithm detects the leaf positions in the images and compares them with a stationary reference leaf. Comparison of the algorithm against angles determined from the locations of fiducial markers shows the accuracy (0.26° rms error) to be sufficient for MVCBI.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 566-569 |
| Number of pages | 4 |
| Journal | Medical Physics |
| Volume | 32 |
| Issue number | 2 |
| DOIs | |
| State | Published - Feb 2005 |
| Externally published | Yes |
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