![]() In the irradiation of breast with tangential fields, the DVH showed that about 7% of the breast volume received at least 110% of the prescribed dose (PD) and about 11% of the breast received less than 98% PD. Results: In the irradiation of lung, DVH calculation indicated that the treatment plan satisfied the dose-volume constraint placed on the lung and z DVH of the lung revealed that a sizable fraction of the lung centered about the central axis (CAX) received a significant dose, a situation that warranted a modification of the treatment plan due to the removal of one lung. In this study, zDVHs were calculated for each CT slice in the treatment field. A z DVH is defined as a differential dose-volume histogram with respect to a computed tomographic (CT) slice position. DVHs were calculated for the entire volume. Materials and Methods: Three-dimensional dose calculations were carried out with various plans for three disease sites: lung, breast, and prostate. ![]() A new concept, the z-dependent dose-volume histogram (z DVH), is presented as a supplement to the DVH in three-dimensional (3D) treatment planning to provide the spatial variation, as well as the size and magnitude of the different dose regions within a region of interest. ![]() Objective: The dose-volume histogram ( DVH) has been accepted as a tool for treatment-plan evaluation. International Nuclear Information System (INIS) Treatment plan evaluation using dose-volume histogram ( DVH) and spatial dose-volume histogram (z DVH) ![]()
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