Aims and objectives
The dramatic rise in the number of Computed Tomography (CT) examinations has led to an increase in cumulative population dose [1] and concern has been raised as to the adverse effects of ionizing radiation,
especially in children and young adults who are more sensitive to radiation [2,3,4].
Hence efforts are being made to reduce the number of unnecessary CT examinations and patient dose associated with each examination by optimizing examination protocols.
The aim of this study was to evaluate subjective and objective image quality in...
Methods and materials
This study was approved by the regional ethical board.
Written consent was obtained from all patients included in the study.
With a third-generation 192-section dual-source CT scanner,
we prospectively obtained two data sets each for 25 patients at 30% and 70% tube loads byproportionately splitting the tube load for a standard full-dose abdominal protocol between the two sources.
The scan parameters are shown in Table 1.
The patient population consisted of 13 females and 12 males,
age range 53 to 92 years (mean:71.6,
SD:10.1) with...
Results
Preliminary Results
Qualitative assessment
Effect of tube load
For all the image criteria assessed,
when comparing 30% and 70% tube loads,
improved image quality was observed as a significant strong effect for the higher tube load regardless of MBIR strength (p<0.001) (Fig.1–5,
Table 2).
Similar results are observed with significant strong effect of higher tube load when comparing the two strengths of the algorithm and same slice thickness individually (Table 4).
Effect of iterative reconstruction algorithm
Using MBIR strength 5 instead of 3 resulted in...
Conclusion
Our intention with this observer evaluation and objective phantom measurement study was to obtain valuable information about the clinical utility of the MBIR algorithm and to estimate the potential dose reduction in order to assess the desired clinical image quality in abdominal CT for optimization purposes.
A visual demonstration of image quality comparison between30% and 70% dose levels reconstructed with MBIR strenghts 3 and 5 at slice thickness 1mm (Fig. 10),
2 mm (Fig. 11) and 3 mm (Fig. 12) in a 65 year old...
Personal information
Presenting author:
Bharti Kataria BSc,
MSc
Department of Radiology,Department of Medical & Health Sciences,
Center for Medical Image Science & Visualization (CMIV),
Linköping University,
Linköping,
Sweden
E-mail:
[email protected]
Address: County Council of Östergötland,
DC
Department of Radiology,
S-581 85 Linköping,
Sweden
Jonas Nilsson Althén,
MSc
Department of Medical Physics,
Department of Medical & Health Sciences,
Linköping University,
Linköping,
Sweden
Address: County Council of Östergötland,
DC
Department of Medical Physics,
S-581 85 Linköping,
Sweden
Örjan Smedby MD,
PhD
School of Technology & Health (STH),KTH Royal Institute,...
References
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et al.
Radiation dose associated with common computed tomography examinations and the associated lifetime attributable risk of cancer.
Arch Intern Med.
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3.Journy NM,
Lee C,
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Projected cancer risks potentially related to past,
current,
and future practices in...