Comparison of Radiation Dosimetry of PET/CT and Ct For Lung and Stomach Wall Organs
Department of Physiology and Medical Physics, College of Medicine, Al-Nahrain University, Baghdad, Iraq
Department of Physiology and Medical Physics, College of Medicine, Al-Nahrain University, Baghdad, Iraq
Baghdad Center for Radiation Therapy and Nuclear Medicine, Medical City, Iraqi Ministry of Health, Baghdad, Iraq
Abstract
Background: Positron Emission Tomography (PET) and Computed Tomography (CT) are devices used for diagnosis purposes. One of their helpful uses is in oncology. This study compares the effective dose of PET and CT scans for the lung and stomach wall. Materials and Methods: 50 patients with lung tumors and 50 patients with stomach wall tumors for 100 people. Each patient type's tumors are split evenly in two. There were 25 patients in each of the three groups. A PET scan was used for the first group, whereas a CT scan was used for the second. After an oncologist made a preliminary diagnosis, PET/CT and CT scans were performed on the patients. All PET and CT patients who have fasted for at least six hours have their blood glucose concentration tested before receiving the radiopharmaceutical. Results: The parameters of patients forwarded to CT scan are analyzed, such as the dose of X-ray (mSv), the current used to heat the filament of the x-ray tube (mAs), and the scanning time for the lung and stomach. CT parameters of the brain show higher current (mAs) than the stomach, lung, and thyroid. The effective dose (mSv), scan time (minute), radiation activity (mCi), and SUV (MBq/ml) acquired by the PET scan are shown to have a highly significant difference among the studied organs (lung and stomach). The effective dose is the stomach's highest, followed by the lung. The lung shows to acquire scanning time (minutes) than the stomach. The activity of the x-ray radiation in mCi was found in the stomach, followed by the lung. The stomach standard uptake value (SUV) was higher than the lung. The results of the effective dose of the CT scan compared with the effective dose of the PET scan shows that the effective dose for the CT scan was significantly higher than the PET scan for all the anatomical sites (lung and stomach). The scanning time of the PET scan compared with the CT scan shows that the PET scan is more significant than the time required for the CT scan. The stomach scan requires more examination time than the PET scan w followed by the lung, while in the CT scan, the scanning time of the stomach was higher than the lung. Conclusion: The effective dose obtained from the CT scan is higher than the PET scan for the brain and thyroid.
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