Image Guidance in Radiation Therapy: Techniques and Applications

<div>Use of MV EPID for online correction using orthogonal 2D images (anteroposterior and lateral). Both the field and the bony anatomy are matched sequentially to give an estimate of error. The comparison of live image with reference DRR helps assess and correct translational shifts but does not estimate rotational errors. (a) Right parietal glioma. (b) Head and neck cancer. MV: Megavoltage; EPID: Electronic portal imaging device; 2D: two-dimensional; DRR: Digital reconstructed radiograph.</div>

Radiology Research and Practice

fig1

Figure 1

Figure 1: Image Guidance in Radiation Therapy: Techniques and Applications 