Patient-size-dependent radiation dose optimisation technique for abdominal CT examinations

2011 ◽  
Vol 148 (2) ◽  
pp. 189-201 ◽  
Author(s):  
J. E. Ngaile ◽  
P. Msaki ◽  
R. Kazema
Keyword(s):  
Radiation Dose ◽  
Abdominal Ct ◽  
Size Dependent ◽  
Dose Optimisation ◽  
Patient Size ◽  
Optimisation Technique

scholarly journals Estimating radiation exposure during paediatric cardiac catheterisation: a potential for radiation reduction with air gap technique

2019 ◽  
Vol 29 (12) ◽  
pp. 1474-1480
Author(s):  
Reid C. Chamberlain ◽  
Alexis C. Shindhelm ◽  
Chu Wang ◽  
Gregory A. Fleming ◽  
Kevin D. Hill
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Air Gap ◽  
Effective Radiation Dose ◽  
Lateral Projection ◽  
Gap Technique ◽  
Dose Optimisation ◽  
Patient Size ◽  
Quality Assessments ◽  
Effective Radiation

AbstractIntroduction:The air gap technique (AGT) is an approach to radiation dose optimisation during fluoroscopy where an “air gap” is used in place of an anti-scatter grid to reduce scatter irradiation. The AGT is effective in adults but remains largely untested in children. Effects are expected to vary depending on patient size and the amount of scatter irradiation produced.Methods:Fluoroscopy and cineangiography were performed using a Phillips Allura Fluoroscope on tissue simulation anthropomorphic phantoms representing a neonate, 5-year-old, and teenager. Monte Carlo simulations were then used to estimate effective radiation dose first using a standard recommended imaging approach and then repeated using the AGT. Objective image quality assessments were performed using an image quality phantom.Results:Effective radiation doses for the neonate and 5-year-old phantom increased consistently (2–92%) when the AGT was used compared to the standard recommended imaging approaches in which the anti-scatter grid is removed at baseline. In the teenage phantom, the AGT reduced effective doses by 5–59%, with greater dose reductions for imaging across the greater thoracic dimension of lateral projection. The AGT increased geometric magnification but with no detectable change in image blur or contrast differentiation.Conclusions:The AGT is an effective approach for dose reduction in larger patients, particularly for lateral imaging. Compared to the current dose optimisation guidelines, the technique may be harmful in smaller children where scatter irradiation is minimal.

RADIATION DOSE DETERMINATION IN ABDOMINAL CT EXAMINATIONS OF CHILDREN AT SUDANESE HOSPITALS USING SIZE-SPECIFIC DOSE ESTIMATES

2018 ◽  
Vol 183 (4) ◽  
pp. 444-449
Author(s):  
Einas H Bashier ◽  
I I Suliman
Keyword(s):  
Reference Levels ◽  
Abdominal Ct ◽  
Dose Determination ◽  
Volume Computed Tomography ◽  
Tube Current ◽  
Dose Optimisation ◽  
Conversion Coefficients ◽  
Patient Size ◽  
Computed Tomography Dose Index ◽  
Slice Location

Abstract In this study, we thought to estimate the radiation exposure of children undergoing multi-detector CT examinations using size-specific dose estimates (SSDE). Console-displayed volume computed tomography dose index (CTDIvol) were recorded for a total of 78 paediatric abdominal CT examinations performed in six hospitals. Measurements of the patient diameters were taken from the mid-slice location on the transverse and scout CT images. Size-specific conversion coefficients were used to translate CTDIvol to the SSDE, according AAPM Report 204. For children aged 0–1 y, CTDIvol, SSDEtrans (from transverse images) and SSDEsco (from scout images) were: 12.80 ± 16.10, 14.43 ± 13.22; and 14.37 ± 13.03 mGy; respectively. For children aged 1–5 y, CTDIvol, SSDEtrans and SSDEsco were: 12.11 ± 14.47, 18.8 ± 18.61 and 16.51 ± 13.55 mGy; respectively. The obtained doses are higher than the corresponding diagnostic reference levels. SSDE increase with patient size as results of tube current modulation and is therefore a valuable tool for dose optimisation.

Study on the Radiation Dose of Abdominal CT Scan Using Dual Energy

2018 ◽  
Vol 20 (2) ◽  
pp. 123-132
Author(s):  
Dae-hyun Park ◽  
Young-Kyoon Kim ◽  
Jong-Ho Ahn ◽  
Kwang-Hyun Chang ◽  
Yoon-Chul Nam ◽  
...  
Keyword(s):  
Radiation Dose ◽  
Ct Scan ◽  
Dual Energy ◽  
Abdominal Ct ◽  
Abdominal Ct Scan

WE-A-218-06: A Practical Method of CT Radiation Dose Adjustment for Patient Size and Tissue Composition

2012 ◽  
Vol 39 (6Part26) ◽  
pp. 3939-3939
Author(s):  
Z Lu ◽  
E Nickoloff ◽  
A Dutta ◽  
J So
Keyword(s):  
Radiation Dose ◽  
Dose Adjustment ◽  
Practical Method ◽  
Tissue Composition ◽  
Ct Radiation ◽  
Patient Size

MO-D-134-05: Size Specific Dose Estimation in Abdominal CT: Impact of Longitudinal Variations in Patient Size

2013 ◽  
Vol 40 (6Part24) ◽  
pp. 402-403 ◽  
Author(s):  
S Leng ◽  
M Shiung ◽  
X Duan ◽  
L Yu ◽  
Y Zhang ◽  
...  
Keyword(s):  
Dose Estimation ◽  
Abdominal Ct ◽  
Longitudinal Variations ◽  
Patient Size

scholarly journals Readjustment of abdominal computed tomography protocols in a university hospital: impact on radiation dose

2015 ◽  
Vol 48 (5) ◽  
pp. 292-297 ◽  
Author(s):  
Ricardo Francisco Tavares Romano ◽  
Priscila Silveira Salvadori ◽  
Lucas Rios Torres ◽  
Elisa Almeida Sathler Bretas ◽  
Daniel Bekhor ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Radiation Dose ◽  
Clinical Suspicion ◽  
University Hospital ◽  
Abdominal Ct ◽  
Abdominal Computed Tomography ◽  
Computed Tomography Scans ◽  
Group A ◽  
Group B ◽  
Tomography Scan

AbstractObjective:To assess the reduction of estimated radiation dose in abdominal computed tomography following the implementation of new scan protocols on the basis of clinical suspicion and of adjusted images acquisition parameters.Materials and Methods:Retrospective and prospective review of reports on radiation dose from abdominal CT scans performed three months before (group A – 551 studies) and three months after (group B – 788 studies) implementation of new scan protocols proposed as a function of clinical indications. Also, the images acquisition parameters were adjusted to reduce the radiation dose at each scan phase. The groups were compared for mean number of acquisition phases, mean CTDIvol per phase, mean DLP per phase, and mean DLP per scan.Results:A significant reduction was observed for group B as regards all the analyzed aspects, as follows: 33.9%, 25.0%, 27.0% and 52.5%, respectively for number of acquisition phases, CTDIvol per phase, DLP per phase and DLP per scan (p < 0.001).Conclusion:The rational use of abdominal computed tomography scan phases based on the clinical suspicion in conjunction with the adjusted images acquisition parameters allows for a 50% reduction in the radiation dose from abdominal computed tomography scans.

Effect of low tube voltage and low iodine concentration abdominal CT on image quality and radiation dose in children: preliminary study

2019 ◽  
Vol 44 (5) ◽  
pp. 1928-1935 ◽  
Author(s):  
Sun Kyoung You ◽  
Young Hun Choi ◽  
Jung-Eun Cheon ◽  
Woo Sun Kim ◽  
In-One Kim ◽  
...  
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Iodine Concentration ◽  
Abdominal Ct ◽  
Tube Voltage ◽  
Low Tube Voltage ◽  
Preliminary Study
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