8th Baltic Congress of Radiology

08.10.2022 Tallinn, Estonia

Evaluation of lung tumor target volume location based on 3DCT and 4DCT scanning

Evita Bladiko (Latvia)

Radiographer, Riga East University Hospital, Oncology Centre of Latvia

Biography: 30 years of experience in medicine – nursing, radiography, radiotherapy and patient care, RTT’s work organization. Now working as Head radiographer in Radiotherapy department and as a lector at University of Latvia in Professional Bachelor Study Program “Radiography”, in cycle “Radiotherapy and oncology”.

Presentation

Terrace Hall

Synopsis: The aim of this study was to investigate the location and movement of the target volume of lung tumor during the respiratory cycle based on 3DCT and 4DCT scans. The bachelor's thesis hypothesis is that the size of the lung tumor and the location of the tumor in the lungs, correlates with the respiratory cycle, influence the choice of radiotherapy method and planning.
For the first time in Latvia, a study was performed to obtain data on the location and volume of the clinical target volume of a tumor in different lung lobes, depending on the patient's inhalation and exhalation. In the study of the thesis, as a result of breathing movements, the greatest movement of the tumor occurs along the z axis or in the cranio-caudal direction - CC direction. On the other hand, smaller tumor movement occurs along the y-axis or in the anterior-posterior direction - the AP direction. Insignificant movement is along the x-axis or in the lateral direction - the LR direction, the exception was during exhalation, when the largest CTV deviations in the LR direction were observed in the upper lobe of the left lung.
The greatest CTV deviations were observed in the CC direction in the inspiratory and expiratory phases for tumors located in the lower lobes of the right and left lungs, and the smallest CTV deviations were observed in all three directions in the inspiratory and expiratory phases in the middle lobe of the right lung.
The largest volume changes between the inspiratory and expiratory phases were obtained in patients whose tumor was located in the lower lobe of the left lung. The smallest volume changes in the difference between inspiratory and expiratory phases were observed in tumors localized in the upper lobe of the right lung.
The breathing movement is affected by deviations in the position of the clinical target volume in the CC or cranio-caudal, LR or lateral and AP or anterior-posterior direction, as well as the volume, each lung cancer patient has an individual parameter, each case must be evaluated individually, in which breathing phase to deliver the ionizing radiation.

This agenda item is presented in the following session: S5-4 CT for Radiographers

Plenary session

08.10.2022 09:00 - 10:30