To assess patterns of H&N IMRT practice with particular emphasis on elective target delineation.
Contrast agents can also improve target delineation but may influence the accuracy of treatment planning algorithms (Ramm et al. 2001).
Markers placed at the borders of esophageal tumors are potentially useful to facilitate radiotherapy (RT) target delineation, which offers the possibility of image-guided RT.
In addition to uncertainties in target delineation, precise and accurate quantification of PET/CT presents a challenge to radiotherapy planning of lung lesions.
Numerous efforts also continue to evaluate 18F-fluorodeoxyglucose (FDG) PET for target delineation in radiotherapy [14, 15] and explore the utility of intensity-modulated radiotherapy (IMRT) based on FDG voxel intensities [16, 17].
Molecular imaging (positron emission tomography, PET) can detect primary PCa with high sensitivity/specificity [1, 2] and can provide an objective tool for target delineation by dose-painting [3].
However, these strategies are heavily reliant on accurate target delineation.
However, the success of these techniques is heavily reliant on accurate target delineation and treatment planning.
A variety of fractionation regimens and target delineation techniques are in common use.
Given the tight GTV to PTV margins applied, accurate target delineation is critical.
Where available, diagnostic PET images were fused with the planning CT to help target delineation.
