Abstract
Introduction: Computed Tomography scan holds much promise for diagnosing most lung solitary nodules; however the CT exposure rates are much higher than the other radiology fields. Besides, there is no sharp border for the size of lung nodules which could be found by CT. Scan. Therefore, there will be an increasing need to find out how we can prevent unnecessary radiation dose to patient while the nodules are clear. Materials and Methods: In this study, a chest phantom including nodules with different sizes and types was designed. Imaging was done by TOSHIBA spiral CT and GE spiral CT with 1, 3 and 5 mm slices, 80 and 120 kVp and 50, 60, 80 and 100 mA. Results : This study revealed, nodules of 4 mm in width were noted both in slices with 120 kV, 50 and 100 mA, and 3 and 5 mm thicknesses and in 80 kV, 60 mA with 3 mm thickness. The calcium carbonated particles were noted only in 6, 8, and 10 mm slice thicknesses; however, a low density of carbonated calcium was noted just in 10 mm nodules. Conclusion: CT. Scan is a useful technique for detection of lung tumor with sizes of more than 4 mm.
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