Gross tumor volume dependency on phase sorting methods of four-dimensional computed tomography images for lung cancer
Radiation Oncology Journal
; : 274-280, 2017.
Article
in En
| WPRIM
| ID: wpr-144700
Responsible library:
WPRO
ABSTRACT
PURPOSE:
To see the gross tumor volume (GTV) dependency according to the phase selection and reconstruction methods, we measured and analyzed the changes of tumor volume and motion at each phase in 20 cases with lung cancer patients who underwent image-guided radiotherapy. MATERIALS ANDMETHODS:
We retrospectively analyzed four-dimensional computed tomography (4D-CT) images in 20 cases of 19 patients who underwent image-guided radiotherapy. The 4D-CT images were reconstructed by the maximum intensity projection (MIP) and the minimum intensity projection (Min-IP) method after sorting phase as 40%–60%, 30%–70%, and 0%–90%. We analyzed the relationship between the range of motion and the change of GTV according to the reconstruction method.RESULTS:
The motion ranges of GTVs are statistically significant only for the tumor motion in craniocaudal direction. The discrepancies of GTV volume and motion between MIP and Min-IP increased rapidly as the wider ranges of duty cycles are selected.CONCLUSION:
As narrow as possible duty cycle such as 40%–60% and MIP reconstruction was suitable for lung cancer if the respiration was stable. Selecting the reconstruction methods and duty cycle is important for small size and for large motion range tumors.Key words
Full text:
1
Index:
WPRIM
Main subject:
Respiration
/
Retrospective Studies
/
Range of Motion, Articular
/
Tumor Burden
/
Four-Dimensional Computed Tomography
/
Radiotherapy, Image-Guided
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Lung
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Lung Neoplasms
/
Methods
Type of study:
Observational_studies
Limits:
Humans
Language:
En
Journal:
Radiation Oncology Journal
Year:
2017
Type:
Article