Pathology-based radiation dose in computed tomography: investigation of the effect of lung lesions on water-equivalent diameter, CTDIVol and SSDE in COVID-19 patients

Author:

Mohammadbeigi Ahmad1,Shouraki Jalal Kargar1,Ebrahiminik Hojat1ORCID,Nouri Majid2,Bagheri Hamed1,Moradi Hamid1,Azizi Ahmad3,Fadaee Narges4,Soltanzadeh Taher5,Moghimi Yousef1

Affiliation:

1. Radiation Sciences Research Center, AJA University of Medical Sciences , Tehran 1411718541, Iran

2. Infectious Diseases Research Center, AJA University of Medical Sciences , Tehran 1411718541, Iran

3. Department of Radiology, Omid Hospital, Iran University of Medical Sciences , Tehran 1476919451, Iran

4. Department of Community and Family Medicine, School of Medicine, Iran University of Medical Sciences , Tehran 1449614535, Iran

5. Naval Healthcare Department, Golestan Hospital, AJA University of Medical Sciences , Tehran 1668619551, Iran

Abstract

Abstract Lung lesions can increase the CT number and affect the water-equivalent diameter (Dw), Dw-based conversion factor (CFw), and Dw-based size-specific dose estimate (SSDEw). We evaluated the effect of COVID-19 lesions and total severity score (TSS) on radiation dose considering the effect of automatic tube current modulation (ATCM) and fixed tube current (FTC). A total of 186 chest CT scans were categorised into five TSS groups, including healthy, minimal, mild, moderate and severe. The effective diameter (Deff), Dw, CFw, Deff-based conversion factor (CFeff), volume computed tomography dose index (CTDIVol), pathological dose impact factor (PDIF) 1 and SSDEw were calculated. TSS was correlated with Dw (r = 0.29, p-value = 0.001), CTDIVol (ATCM) (r = 0.23, p = 0.001) and PDIF (r = − 0.51, p-value = 0.001). $\overline{{\mathrm{SSDE}}_{\mathrm{w}}}$ (FTC) was significantly different among all groups. $\overline{{\mathrm{SSDE}}_{\mathrm{w}}}$ (ATCM) was greater for moderate (13%) and mild (14%) groups. Increasing TSS increase the Dw and causes a decrease in CFw and $\overline{{\mathrm{SSDE}}_{\mathrm{w}}}$ (FTC), and can increase $\overline{{\mathrm{SSDE}}_{\mathrm{w}}}$ (ATCM) in some Dw ranges.

Funder

Research Council of AJA University of Medical Sciences

Publisher

Oxford University Press (OUP)

Subject

Public Health, Environmental and Occupational Health,Radiology, Nuclear Medicine and imaging,General Medicine,Radiation,Radiological and Ultrasound Technology

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