PMID- 37619552
OWN - NLM
STAT- MEDLINE
DCOM- 20230912
LR  - 20230913
IS  - 1361-6498 (Electronic)
IS  - 0952-4746 (Linking)
VI  - 43
IP  - 3
DP  - 2023 Sep 11
TI  - Influence of tube and patient positioning in thoracoabdominal CT examinations on 
      radiation exposure-towards a better patient positioning.
LID - 10.1088/1361-6498/acf384 [doi]
AB  - Although iso-centric patient positioning is enormously important in computed 
      tomography (CT), it is complicated in thoracoabdominal imaging by the varying 
      dimensions of the body. Patient positioning can affect the appearance of the 
      patient on the localiser. Positioned too close to the x-ray tube, a patient 
      appears considerably more voluminous. The goal of this study is to assess the 
      difference in radiation exposure of combined chest and abdomen CT scans between 
      scans with prior 0 degrees - and 180 degrees -localisers in conjunction with patient positioning. 
      In this IRB-approved retrospective study, patients who had two routine 
      thoracoabdominal CT scans on the same CT scanner, one with a prior 0 degrees - and one 
      with a prior 180 degrees -localiser, were included. To evaluate the radiation exposure of 
      the thoracoabdominal CT examination regarding the tube position during the 
      localiser, volumetric computed tomography dose index (CTDI(vol)), size-specific 
      dose estimate (SSDE), patient diameter and positioning within the iso-centre for 
      three positions (heart, abdomen, femur level) were compared with regard to the 
      tube position during the prior localiser. CT examinations of 114 patients were 
      included. Despite similar patient weight and diameter between the two 
      examinations, SSDE and CTDI(vol)was significantly larger (up to 73%) with 
      180 degrees -localisers. Patient offset from the iso-centre ranged between -9 mm at the 
      centre slice (abdomen level) to -43 mm at the most caudal slice at the pelvis 
      (femur level), causing a significant magnification (p < 0.001) on 180 degrees -localisers 
      with a subsequent increase of the apparent attenuation. The results of this study 
      emphasise the use of 0 degrees -localisers in thoracoabdominal CTs, since 180 degrees -localisers 
      caused patient magnification with subsequent increase in radiation exposure. The 
      advantage of 180 degrees -localisers, namely reducing the dose in thyroid and breast, is 
      eliminated if the dose of the CT scan increases significantly in the abdomen and 
      pelvis.
CI  - Creative Commons Attribution license.
FAU - Valentin, Birte
AU  - Valentin B
AD  - University Dusseldorf, Medical Faculty, Department of Diagnostic and 
      Interventional Radiology, Dusseldorf D-40225, Germany.
FAU - Kamp, Benedikt
AU  - Kamp B
AD  - University Dusseldorf, Medical Faculty, Department of Diagnostic and 
      Interventional Radiology, Dusseldorf D-40225, Germany.
FAU - Henke, Jan
AU  - Henke J
AD  - University Dusseldorf, Medical Faculty, Department of Nuclear Medicine, 
      Dusseldorf D-40225, Germany.
FAU - Ljimani, Alexandra
AU  - Ljimani A
AD  - University Dusseldorf, Medical Faculty, Department of Diagnostic and 
      Interventional Radiology, Dusseldorf D-40225, Germany.
FAU - Appel, Elisabeth
AU  - Appel E
AD  - University Dusseldorf, Medical Faculty, Department of Diagnostic and 
      Interventional Radiology, Dusseldorf D-40225, Germany.
FAU - Antoch, Gerald
AU  - Antoch G
AD  - University Dusseldorf, Medical Faculty, Department of Diagnostic and 
      Interventional Radiology, Dusseldorf D-40225, Germany.
FAU - Steuwe, Andrea
AU  - Steuwe A
AUID- ORCID: 0000-0001-6259-5765
AD  - University Dusseldorf, Medical Faculty, Department of Diagnostic and 
      Interventional Radiology, Dusseldorf D-40225, Germany.
LA  - eng
PT  - Journal Article
DEP - 20230911
PL  - England
TA  - J Radiol Prot
JT  - Journal of radiological protection : official journal of the Society for 
      Radiological Protection
JID - 8809257
SB  - IM
MH  - Humans
MH  - Retrospective Studies
MH  - *Tomography, X-Ray Computed
MH  - Tomography Scanners, X-Ray Computed
MH  - *Radiation Exposure
MH  - Patient Positioning
OTO - NOTNLM
OT  - computed tomography
OT  - localiser
OT  - patient positioning
OT  - radiation exposure
EDAT- 2023/08/25 00:42
MHDA- 2023/09/12 06:41
CRDT- 2023/08/24 18:32
PHST- 2023/07/14 00:00 [received]
PHST- 2023/08/24 00:00 [accepted]
PHST- 2023/09/12 06:41 [medline]
PHST- 2023/08/25 00:42 [pubmed]
PHST- 2023/08/24 18:32 [entrez]
AID - 10.1088/1361-6498/acf384 [doi]
PST - epublish
SO  - J Radiol Prot. 2023 Sep 11;43(3). doi: 10.1088/1361-6498/acf384.