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Optimization of a low-dose 320-slice multi-detector computed tomography chest protocol using a phantom Cover

Optimization of a low-dose 320-slice multi-detector computed tomography chest protocol using a phantom

Asian Biomedicine
Volume 10 (2016): Issue 3 (June 2016)
By: Chatnapa Nuntue,  Anchali Krisanachinda and  Kitiwat Khamwan  
Open Access
|Jan 2017

Figures & Tables

Figure 1

The inner components of the LUNGMAN phantom, B: Various sphere sizes of simulated lung nodules of 3, 5, 8, 10, and 12 mm in diameter
The inner components of the LUNGMAN phantom, B: Various sphere sizes of simulated lung nodules of 3, 5, 8, 10, and 12 mm in diameter

Figure 2

The location of ROIs for measuring the CT number of nodule and background
The location of ROIs for measuring the CT number of nodule and background

Figure 3

The relationship between average %CNR for all lung nodule sizes and radiation doses obtained from 320-slice MDCT with various targeted SD and beam pitch for 120 and 100 kVp
The relationship between average %CNR for all lung nodule sizes and radiation doses obtained from 320-slice MDCT with various targeted SD and beam pitch for 120 and 100 kVp

Figure 4

Computed tomography chest images with 5 mm nodule in diameter (arrow) at target SD 20, 10–400 mA, pitch 0.813 and 120 kVp, and displayed with (A) soft tissue window, WL/WW setting of 60/360 Hounsfield Units (HU) and (B) lung window, WL/WW setting of –600/1600 HU
Computed tomography chest images with 5 mm nodule in diameter (arrow) at target SD 20, 10–400 mA, pitch 0.813 and 120 kVp, and displayed with (A) soft tissue window, WL/WW setting of 60/360 Hounsfield Units (HU) and (B) lung window, WL/WW setting of –600/1600 HU

Figure 5

Plot of volume of computed tomography detector index (CTDIvol) displayed on the monitor (solid line) and measured CTDIvol (dash line) using body technique as a function of kVp for CTDIvol verification of less than 10% discrepancy
Plot of volume of computed tomography detector index (CTDIvol) displayed on the monitor (solid line) and measured CTDIvol (dash line) using body technique as a function of kVp for CTDIvol verification of less than 10% discrepancy

Radiation exposure from various targeted SD and helical pitch at 120 and 100 kVp

kVpPitchTargeted SDCTDIvol (mGy)
1200.63797
143.1
201.2
250.9
0.81395.9
142.5
201.1
250.7
1.38896.5
142.7
201.3
250.9
1000.63796
142.4
201.3
250.8
0.81395.3
142.5
201.2
250.8
1.38896.2
142.4
201.4
250.9

The percent reduction of CTDIvol compared with the default setting protocol with increasing targeted SD and helical pitch at 100 and 120 kVp

kVpPitch%CTDIvol reduction
Targeted SD
9142025
1000.637+1.69–59.32–77.97–86.44
1000.813–10.16–57.63–79.66–86.44
1001.388+5.0861.0277.9784.75
1200.637+18.64–47.54–79.66–84.74
1200.8130 (default)–40.68–81.35–88.14
1201.388+10.17–54.24–77.97–84.74
DOI: https://doi.org/10.5372/1905-7415.1003.490 | Journal eISSN: 1875-855X | Journal ISSN: 1905-7415
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Language: English
Page range: 269 - 276
Published on: Jan 31, 2017
Published by: Chulalongkorn University
In partnership with: Paradigm Publishing Services
Publication frequency: 6 issues per year
Keywords:
CT chest,
CT noise index,
MDCT,
radiation dose reduction,
targeted SD
Related subjects:
Medicine,
Assistive professions, nursing,
Basic medical science,
Basic medical science, other,
Clinical medicine,
Clinical medicine, other

© 2017 Chatnapa Nuntue, Anchali Krisanachinda, Kitiwat Khamwan, published by Chulalongkorn University
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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