The study of radiation effective dose and absorbed dose in lung cancer patients using CT simulator in Sakon Nakhon hospital
Keywords:
radiation effective dose, Radiation absorbed dose, CT simulatorAbstract
This descriptive study aimed to calculate the effective dose and absorbed dose received by lung cancer patients whom underwent computed tomography simulation. Nowadays, respiratory gating is used to detect a patient's breathing in order to determine the location of the planning target volume (PTV) during treatment planning and radiation delivery, to reduce complications on the organs at risk (OARs). Due to insufficient budget to provide such equipment in Sakon Nakhon Hospital, we developed a treatment simulation with 3 series technique to determine the location of the tumor instead of respiratory gating. Fifty lung cancer patients consisting of 27 males and 23 females aged between 23-85 years old were studied from December 6, 2017 to June 30, 2018 in radiation therapy unit, Sakon Nakhon Hospital. All patients were scanned by a Computed Tomography simulator with 3 series of treatment simulation technique, consisting of full inspiration, full expiration and free breathing with contrast medium administration. For each patient, images obtained from each series were imported and fused on the computer treatment planning system to delineate the PTV and OARs. The effective dose and absorbed dose were calculated by IMPACT program version 1.0.4. The results showed that average, minimum and maximum effective dose were 23.01, 19.50 and 40.50 millisievert (mSv) respectively, for the average absorbed dose in the esophagus, lungs, heart, breast, adrenal glands, liver, pancreas, spleen, stomach, kidneys and small intestine were between 4.70-33.64 milligray (mGy). In conclusion, the simulation of lung cancer patients with 3 series technique increases effective dose and absorbed dose received by the patients but it will assist radiation oncologists to determine the PTV and OARs to receive a proper dose as specified in the treatment plan.
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