SU-E-J-106: Study of Variation of Internal Taget Volume Between 4DCT and Slow-CT in Respiratory Patterns Using Respiratory Motion Phantom




The objective of this study is to investigate the difference of ITV lengths and ITVs between 4DCT and Slow-CT images according to respiratory patterns using a respiratory motion phantom.


The respiratory periods 1∼4s and target motion 1∼3 cm were applied on each respiratory pattern. 4DCT and Slow-CT images were acquired for 3 times. 4DCT and Slow-CT ITVs were measured with contouring the target in the Eclipse RTP system. The measured ITV lenghts and ITVs in 4DCT and Slow-CT images were compared to the known values.


For the ITV lengths and ITVs in the 4DCT, the difference of them were reduced as the respiratory period is longer and target motion is shorter. For the Slow-CT, there was same tendency with change in 4DCT ITV lengths and ITVs about target motion. According to the respiratory patterns, pattern A had the highest reproducibility. Pattern B, C and D were showed the difference similar to each other. However, for pattern E, the reproducibility was the lowest compared with other four patterns. The difference of ITV lengths and ITVs between Slow-CT and 4DCT was increased by increasing the respiratory periods and target motion for all respiratory patterns. In case of pattern A, B and C, length difference was 3 mm at S(superior) and I(inferior) direction, and the length difference of pattern D was 1.45 cm at only “I” direction whereas the length difference of pattern E was 5 mm longer in “S” direction than “I” direction.


The margin in SI directions should be determined by considering the respiratory patterns when the margin of Slow-CT is compensated for 4DCT ITV lengths. Afterward, we think that the Resultof this study will be useful to analyze the ITV lengths and ITVs from the CT images on the basis of the patient respiratory signals.