Iterative reconstructed ultra high pitch CT pulmonary angiography with cardiac bowtie-shaped filter in the acute setting: Effect on dose and image quality

2013 ◽  
Vol 82 (9) ◽  
pp. 1571-1576 ◽  
Author(s):  
Steven J. Co ◽  
John Mayo ◽  
Teresa Liang ◽  
Karl Krzymyk ◽  
Masoud Yousefi ◽  
...  
Keyword(s):  
Image Quality ◽  
Pulmonary Angiography ◽  
High Pitch ◽  
Ct Pulmonary Angiography ◽  
Acute Setting

scholarly journals Minimizing contrast media dose in CT pulmonary angiography with high-pitch technique

2020 ◽  
Vol 93 (1111) ◽  
pp. 20190995
Author(s):  
Hanan Alobeidi ◽  
Muhammed Alshamari ◽  
Jonas Widell ◽  
Tomas Eriksson ◽  
Mats Lidén
Keyword(s):  
Pulmonary Embolism ◽  
Image Quality ◽  
Contrast Media ◽  
Hounsfield Unit ◽  
Pulmonary Angiography ◽  
Chest Ct ◽  
Minimal Amount ◽  
High Pitch ◽  
Ct Pulmonary Angiography ◽  
Saline Bolus

Objectives: To perform CT pulmonary angiography (CTPA) using a minimal amount of iodinated contrast media. Methods: 47 patients (25 females) with mean age 69 years (range 41–82 years) referred for contrast-enhanced chest CT were prospectively included in this Phase IV clinical drug trial. All participants underwent a study specific CTPA in addition to the chest CT. The participants received 80 mg I/kg body weight Iohexol contrast media using a preparatory saline bolus, a dual flow contrast/saline bolus and a saline flush, and a scanner protocol with 80 kVp dual source high-pitch mode. Three readers independently assessed the image quality on the 3-point scale non-diagnostic, adequate or good-excellent image quality. Additionally, the pulmonary arterial contrast opacification was measured. Results: On average, the patients received 16.8 ml Iohexol 350 mg I/mL (range 12–20 ml). Mean patient weight was 71 kg (range 50–85 kg). Identically for all readers, pulmonary embolism (PE) was detected in 1/47 participants. The median number of examinations visually scored concerning pulmonary embolism as good–excellent was 47/47 (range 44–47); adequate 0/47 (0–3) and non-diagnostic 0/47 (range 0–0). The proportion adequate or better examinations was for all readers 47/47, 100% [95% confidence interval 92–100%]. The mean attenuation ± standard deviation in the pulmonary trunk was 325 ± 72 Hounsfield unit (range 165–531 Hounsfield unit). Conclusions: Diagnostic CTPA with 17 ml contrast media is possible in non-obese patients using low kVp, high pitch and carefully designed contrast media administration. Advances in knowledge: By combining several procedures in a CTPA protocol, the contrast media dose can be minimized.

A Systematic Review of Double Low-dose CT Pulmonary Angiography in Pulmonary Embolism

2019 ◽  
Vol 15 (5) ◽  
pp. 453-460 ◽  
Author(s):  
Sultan Aldosari ◽  
Zhonghua Sun
Keyword(s):  
Systematic Review ◽  
Pulmonary Embolism ◽  
Image Quality ◽  
Radiation Dose ◽  
Contrast Medium ◽  
Low Dose ◽  
Pulmonary Angiography ◽  
Ct Pulmonary Angiography ◽  
Low Contrast ◽  
Low Contrast Medium

Background: The aim of this study is to perform a systematic review of the feasibility and clinical application of double low-dose CT pulmonary angiography (CTPA) in the diagnosis of patients with suspected pulmonary embolism. Discussion: A total of 13 studies were found to meet selection criteria reporting both low radiation dose (70 or 80 kVp versus 100 or 120 kVp) and low contrast medium dose CTPA protocols. Lowdose CTPA resulted in radiation dose reduction from 29.6% to 87.5% in 12 studies (range: 0.4 to 23.5 mSv), while in one study, radiation dose was increased in the dual-energy CT group when compared to the standard 120 kVp group. CTPA with use of low contrast medium volume (range: 20 to 75 ml) was compared to standard CTPA (range: 50 to 101 ml) in 12 studies with reduction between 25 and 67%, while in the remaining study, low iodine concentration was used with 23% dose reduction achieved. Quantitative assessment of image quality (in terms of signal-to-noise ratio and contrast-to-noise ratio) showed that low-dose CTPA was associated with higher, lower and no change in image quality in 3, 3 and 6 studies, respectively when compared to the standard CTPA protocol. The subjective assessment indicated similar image quality in 11 studies between low-dose and standard CTPA groups, and improved image quality in 1 study with low-dose CTPA. Conclusion: This review shows that double low-dose CTPA is feasible in the diagnosis of pulmonary embolism with significant reductions in both radiation and contrast medium doses, without compromising diagnostic image quality.

scholarly journals Ultra-low dose contrast CT pulmonary angiography in oncology patients using a high-pitch helical dual-source technology

2019 ◽  
Vol 25 (3) ◽  
pp. 195-203 ◽  
Author(s):  
Prabhakar Rajiah ◽  
◽  
Leslie Ciancibello ◽  
Ronald Novak ◽  
Jennifer Sposato ◽  
...  
Keyword(s):  
Low Dose ◽  
Pulmonary Angiography ◽  
High Pitch ◽  
Ct Pulmonary Angiography ◽  
Oncology Patients ◽  
Dual Source ◽  
Contrast Ct

Single- and dual-energy CT pulmonary angiography using second- and third-generation dual-source CT systems: comparison of radiation dose and image quality

2019 ◽  
Vol 29 (9) ◽  
pp. 4603-4612 ◽  
Author(s):  
Lukas Lenga ◽  
Franziska Trapp ◽  
Moritz H. Albrecht ◽  
Julian L. Wichmann ◽  
Addison A. Johnson ◽  
...  
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Pulmonary Angiography ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Third Generation ◽  
Dual Source Ct ◽  
Ct Pulmonary Angiography ◽  
Dual Source

High-pitch versus standard mode CT pulmonary angiography: a comparison of indeterminate studies

2018 ◽  
Vol 26 (2) ◽  
pp. 155-159 ◽  
Author(s):  
Derrick A. Doolittle ◽  
Adam T. Froemming ◽  
Christian W. Cox
Keyword(s):  
Pulmonary Angiography ◽  
High Pitch ◽  
Ct Pulmonary Angiography ◽  
Standard Mode

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.

Diagnostic confidence and image quality of CT pulmonary angiography at 100 kVp in overweight and obese patients

2015 ◽  
Vol 70 (1) ◽  
pp. 54-61 ◽  
Author(s):  
B. Megyeri ◽  
A. Christe ◽  
S.T. Schindera ◽  
E. Horkay ◽  
J. Sikula ◽  
...  
Keyword(s):  
Image Quality ◽  
Pulmonary Angiography ◽  
Obese Patients ◽  
Ct Pulmonary Angiography ◽  
Diagnostic Confidence
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