CT pulmonary angiography using organ dose modulation with an iterative reconstruction algorithm and 3D Smart mA in different body mass indices: image quality and radiation dose

2018 ◽  
Vol 123 (9) ◽  
pp. 676-685 ◽  
Author(s):  
Yongxia Zhao ◽  
Ziwei Zuo ◽  
Shujie Cheng ◽  
Yanmin Wu
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Body Mass ◽  
Iterative Reconstruction ◽  
Reconstruction Algorithm ◽  
Organ Dose ◽  
Pulmonary Angiography ◽  
Ct Pulmonary Angiography ◽  
Iterative Reconstruction Algorithm ◽  
Dose Modulation

scholarly journals Effect of iterative reconstruction algorithm levels on noise index and figure-of-merit in CT pulmonary angiography examinations

2020 ◽  
Vol 28 (5) ◽  
pp. 893-903
Author(s):  
H.H. Harun ◽  
M.K.A. Karim ◽  
Z. Abbas ◽  
A. Sabarudin ◽  
S.C. Muniandy ◽  
...  
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Pulmonary Artery ◽  
Iterative Reconstruction ◽  
Figure Of Merit ◽  
Pulmonary Angiography ◽  
Volume Data ◽  
Ct Pulmonary Angiography ◽  
Increase With Increase ◽  
The Mean

PURPOSE: To evaluate the influence of iterative reconstruction (IR) levels on Computed Tomography (CT) image quality and to establish Figure of Merit (FOM) value for CT Pulmonary Angiography (CTPA) examinations. METHODS: Images of 31 adult patients who underwent CTPA examinations in our institution from March to April 2019 were retrospectively collected. Other data, such as scanning parameters, radiation dose and body habitus information from the subjects were also recorded. Six different levels of IR were applied to the volume data of the subjects. Five circles of the region of interest (ROI) were drawn in five different arteries namely, pulmonary trunk, right pulmonary artery, left pulmonary artery, ascending aorta and descending aorta. The mean Signal-to-noise ratio (SNR) was obtained, and the FOM was calculated in a fraction of the SNR2 divided by volume-weighted CT dose index (CTDIvol) and SNR2 divided by the size-specific dose estimates (SSDE). RESULTS: Overall, we observed that the mean value of CTDIvol and SSDE were 13.79±7.72 mGy and 17.25±8.92 mGy, respectively. Notably, SNR values significantly increase with increase of the IR level (p < 0.05). There are also significant differences (p < 0.05) in the FOM for both SNR2/SSDE and SNR2/CTDIvol attained in different IR levels. CONCLUSION: We successfully evaluate the value of radiation dose and image quality performance and set up a figure of merit for both parameters to further verify scanning protocols by radiology personnel.

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