Effect of changing field of view (FOV) on radiation dose and image quality of HRCT scan of chest in patients with lung diseases at Sunpasitthiprasong Hospital

Authors

  • Nitaya Snitwongse na Ayudhya Diagnostic Radiology Unit, Department of Radiology, Sunpasitthiprasong Hospital, Ubonratchathani

Keywords:

Field of view (FOV), Radiation dose, CT image quality, HRCT chest, Patients with lung diseases

Abstract

High-resolution computed tomography of the chest (HRCT chest) is a method for diagnosing diseases involving the lungs and airways.  This quasi-experimental study aimed to evaluate the effects of changing the scan field of view (sFOV) on radiation dose and image quality in HRCT chest in patients with lung diseases. The study was divided into two phases: 1) the VCT QA phantom study and 2) the study in patients with lung diseases who underwent HRCT chest weighing up to 55 kg. The results of the phantom study revealed that using the sFOV of the large body (500 mm) and small body (320 mm), 80-120 kVp, dose length product (DLP) values were measured equal to 9.99 -253.00 and 9.25 -221.28 mGy.cm respectively, the difference in DLP values at 120 kV was 12.53 ± 0.08 percent. CNR values were calculated at 0.45-2.68 and 0.41-2.84, respectively. Data collection results in 40 patients undergoing HRCT chest using small-body sFOV found that CTDIvol values (inspiration and expiration) were 4.84 ±1.24 and 3.78± 0.90 mGy, respectively. The DLP value (total) was 290.72 ±69.91 mGy.cm. In a review of 40 patients undergoing HRCT chest with large body sFOV, CTDIvol values for inspiration and expiration were 5.70 ±1.57 and 4.54 ± 0.76 mGy, respectively. DLP values (total) per case equaled 355.49 ± 79.38 mGy.cm. CT dose values (DLP) in both groups were significantly different (p < 0.001). On the topic of image resolution and contrast evaluated by radiologists, the average scores of 4.47 and 4.40 points were the same for both groups. The scan field of view should be selected according to the patient's size to reduce the radiation dose.

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Published

2023-01-24

How to Cite

Snitwongse na Ayudhya, N. (2023). Effect of changing field of view (FOV) on radiation dose and image quality of HRCT scan of chest in patients with lung diseases at Sunpasitthiprasong Hospital. Journal of Medicine and Public Health, Ubon Ratchathani University, 6(1), 49–59. Retrieved from https://he01.tci-thaijo.org/index.php/jmpubu/article/view/259672

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Research Articles