Dose development in sinonasal imaging over the last decade – a retrospective patient study

Head & Face Medicine

Table 2 Overview on CTDI_Vol and DLP values for each scanning protocol for chronic sinusitis diagnostic

	CTDI_Vol		DLP
Scanning protocol	Mean (mGy)	Reduction in % compared to DS 64 / FBP	Mean ± Std. Dev. (mGy x cm)			Reduction in % compared to DS 64 / FBP
DS 64 / FBP	3.8	-	55	±	4	-
DS 64 / 1st Gen.	3.5	8	51	±	6	7
DS 64 / 2nd Gen.	3.0	20	50	±	6	10
SS 128 / FBP	3.1	20	39	±	3	29
SS 128 / 2nd Gen.	2.2	43	32	±	3	42
DS 192 / 3rd Gen. + ATCM	0.3	92	6	±	1	90
DS 192 / 3rd Gen. - ATCM	0.4	90	7	±	1	88
DS 192 / 3rd Gen. 2022	1.0	73	15	±	2	72
CBCT	4.7	+ 23	52	±	19	6

Mean value (± standard deviation) of CTDI_Vol and DLP values of protocols used for diagnosing chronic sinusitis in the past 12 years. Additionally, the dose reduction in percent per scan protocol compared the DS 64 / FBP protocol is shown for the CTDI_Vol and DLP values. The protocol name consists out of the Scanner (DS 64, SS 128, DS 192) and the reconstruction method (FBP, 1st, 2nd and 3rd Generation of iterative reconstruction). Since 3rd Generation iterative reconstruction was used for all DS 192 protocols, additional information, such as with or without automatic tube current modulation or the year of acquisition, was added. ATCM = automatic tube current modulation, CBCT = cone beam CT, CT = computed tomography, CTDI_Vol = computed tomography dose index, DLP = dose length product, FBP = filtered back projection, Gen. = generation.

ISSN: 1746-160X