PMID- 33231200
OWN - NLM
STAT- MEDLINE
DCOM- 20210106
LR  - 20210106
IS  - 1361-6560 (Electronic)
IS  - 0031-9155 (Linking)
VI  - 65
IP  - 22
DP  - 2020 Nov 24
TI  - A study of the impact of x-ray tube performance on angiography system imaging 
      efficiency.
PG  - 225028
LID - 10.1088/1361-6560/abbb7a [doi]
AB  - This work compared the impact of x-ray tube performance and automatic dose rate 
      control (ADRC) parameter selection on system imaging efficiency of two Siemens 
      angiography systems: a Siemens Megalix x-ray tube installed on an Artis Zee 
      system (denoted 'MEGALIX') and a newer generation Gigalix x-ray tube installed on 
      an Artis Q (denoted 'GIGALIX'). A method was used that accounted for two 
      potential sources of bias in this comparison: differences in radiation output 
      between the x-ray tubes and differences between the x-ray detectors on the two 
      systems. First, ADRC x-ray factors (tube voltage, tube current, pulse length, 
      focus size, spectral prefilter) and radiation output were recorded as a function 
      of poly(methyl) methacrylate (PMMA) thickness on the MEGALIX unit. These factors 
      were then applied manually on the GIGALIX system and incident air kerma rate 
      (IAKR) and signal difference to noise ratio (SDNR) were measured. Second, the 
      ADRC on the GIGALIX system was used to give the x-ray factors and both IAKR and 
      SDNR relevant to the GIGALIX based system directly. This method enabled the SDNR 
      to be measured from images acquired on the same x-ray detector. SDNR and IAKR 
      were measured on both systems using a PMMA phantom covering thicknesses from 6 cm 
      to 40 cm. A small 0.3 mm iron insert was used to measure SDNR, which was then 
      multiplied by modulation transfer function based weighting factors for focal spot 
      blurring and motion blurring. These factors were evaluated for an object motion 
      of 25 mm s(-1) and at a spatial frequency of 1.4 mm(-1) in the object plane, 
      relevant to interventional cardiology, giving a spatial frequency dependent 
      SDNR(u). In the second phase of the study, a technical figure of merit (FOM) was 
      used to express imaging performance of both systems, calculated as 
      SDNR(2)(u)/IAKR. Averaged over all phantom thicknesses, the FOM of the 
      GIGALIX-based system was 42% and 73% higher compared to that of the MEGALIX based 
      system, for fluoroscopy and acquisition mode respectively. The results indicate 
      that increased x-ray tube power and smaller foci can improve overall system 
      efficiency and reduce doses.
FAU - Dehairs, M
AU  - Dehairs M
AD  - Department of Radiology, UZ Gasthuisberg, Herestraat 49, 3000, Leuven, Belgium.
FAU - Bosmans, H
AU  - Bosmans H
FAU - Marshall, N W
AU  - Marshall NW
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20201124
PL  - England
TA  - Phys Med Biol
JT  - Physics in medicine and biology
JID - 0401220
RN  - 9011-14-7 (Polymethyl Methacrylate)
SB  - IM
MH  - Air
MH  - Angiography/*instrumentation
MH  - Humans
MH  - Phantoms, Imaging
MH  - Polymethyl Methacrylate
MH  - Radiation Dosage
MH  - Signal-To-Noise Ratio
MH  - X-Rays
EDAT- 2020/11/25 06:00
MHDA- 2021/01/07 06:00
CRDT- 2020/11/24 08:37
PHST- 2020/11/24 08:37 [entrez]
PHST- 2020/11/25 06:00 [pubmed]
PHST- 2021/01/07 06:00 [medline]
AID - 10.1088/1361-6560/abbb7a [doi]
PST - epublish
SO  - Phys Med Biol. 2020 Nov 24;65(22):225028. doi: 10.1088/1361-6560/abbb7a.