Absorbed Radiation Dose in Radiosensitive Organs Using 64- and 320-Row Multidetector Computed Tomography: A Comparative Study

Abstract

Aim. To determine absorbed radiation dose (ARD) in radiosensitive organs during prospective and full phase dose modulation using ECG-gated MDCTA scanner under 64- and 320-row detector modes. Methods. Female phantom was used to measure organ radiation dose. Five DP-3 radiation detectors were used to measure ARD to lungs, breast, and thyroid using the Aquilion ONE scanner in 64- and 320-row modes using both prospective and dose modulation in full phase acquisition. Five measurements were made using three tube voltages: 100, 120, and 135 kVp at 400 mA at heart rate (HR) of 60 and 75 bpm for each protocol. Mean acquisition was recorded in milligrays (mGy). Results. Mean ARD was less for 320-row versus 64-row mode for each imaging protocol. Prospective EKG-gated imaging protocol resulted in a statistically lower ARD using 320-row versus 64-row modes for midbreast (6.728 versus 19.687 mGy, P < 0.001), lung (6.102 versus 21.841 mGy, P < 0.001), and thyroid gland (0.208 versus 0.913 mGy; P < 0.001). Retrospective imaging using 320- versus 64-row modes showed lower ARD for midbreast (10.839 versus 43.169 mGy, P < 0.001), lung (8.848 versus 47.877 mGy, P < 0.001), and thyroid gland (0.057 versus 2.091 mGy; P < 0.001). ARD reduction was observed at lower kVp and heart rate. Conclusions. Dose reduction to radiosensitive organs is achieved using 320-row compared to 64-row modes for both prospective and retrospective gating, whereas 64-row mode is equivalent to the same model 64-row MDCT scanner.

Effect of Spirulina platensis against Thyroid Disorders Associated with Liver Dysfunction and Dyslipidaemia in Irradiated Rats

“…Accumulated evidence has demonstrated that oxidative stress in different tissues is the underlying mechanism of radiation damage. The results of extensive studies have demonstrated that the thyroid gland is a radiosensitive organ (Khan et al, 2014) and that the exposure to ionizing radiation may induce thyroid disorders (Zhai et al, 2017).…”

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“…In the examination room, the adult phantoms have been placed on the table and, with the aid of laser lights; they were oriented so that their central axis passed through the isocenter of the gantry during the table displacement [19,20]. They central area of the phantoms were scanned in helical mode with voltages of 120 and 135 kV using the system automatic control, electrical current in automatic, in the rage of 50 to 500 mA [12,13,20].…”

Quantitative Analysis of Conebeam CT for Delineating Stents in Stent-Assisted Coil Embolization

“…17 There have been reports that when the same area is imaged, the DAP in CBCT is similar to the CT dose index in multidetector CT without a moving cradle. [18][19][20][21] The data acquired from group B images were approximately half of the data acquired from group A images. However, the DAP values observed in group B were reduced by approximately 70% compared with the patients in group A.…”