scholarly journals The effectiveness of the Safety in Interventional Radiology (SIR) Shield in reducing droplet transmission and its effect on image quality and radiation dose

2021 ◽  
Author(s):  
Shao Jin Ong ◽  
Gopinathan Anil ◽  
Koon Liang Chia ◽  
Deborah Khoo ◽  
Joseph KT Lee ◽  
...  
Keyword(s):  
Interventional Radiology ◽  
Image Quality ◽  
Radiation Dose ◽  
Line Pair ◽  
Subjective Change ◽  
Practical Evaluation ◽  
Significant Difference ◽  
Test Phantom ◽  
First Time ◽  
Droplet Transmission

Objective: To evaluate the efficacy of a barrier shield in reducing droplet transmission and its effect on image quality and radiation dose in an interventional suite. Methods: A human cough droplet visualisation model in a supine position was developed to assess efficacy of barrier shield in reducing environmental contamination. Its effect on image quality (resolution and contrast) was evaluated via image quality test phantom. Changes in the radiation dose to patient post-shield utilisation was measured. Results: Use of the shield prevented escape of visible fluorescent cough droplets from the containment area. No subjective change in line-pair resolution was observed. No significant difference in contrast-to-noise ratio was measured. Radiation dosage to patient was increased; this is predominantly attributed to the increased air gap and not the physical properties of the shield. Conclusion: Use of the barrier shield provided an effective added layer of personal protection in the interventional radiology theatre for aerosol generating procedures. Advances in knowledge: This is the first time a human supine cough droplet visualisation has been developed. While multiple types of barrier shields have been described, this is the first systematic practical evaluation of a barrier shield designed for use in the interventional radiology theatre.

Ultra-low-dose CT-guided lung biopsy in clinic: radiation dose, accuracy, image quality, and complication rate

2020 ◽  
pp. 028418512091762
Author(s):  
Ting Liang ◽  
Yonghao Du ◽  
Chenguang Guo ◽  
Yuan Wang ◽  
Jin Shang ◽  
...  
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Complication Rate ◽  
Lung Biopsy ◽  
Ct Guided ◽  
Significant Difference ◽  
Group A ◽  
Mode Group ◽  
Dose Accuracy ◽  
Group B

Background Computed tomography (CT)-guided percutaneous lung biopsy is usually performed by helical scanning. However, there are no studies on radiation dose, diagnostic accuracy, image quality, and complications based on axial scan mode. Purpose To determine radiation dose, accuracy, image quality, and complication rate following an ultra-low-dose (ULD) protocol for CT-guided lung biopsy in clinic. Material and Methods A total of 105 patients were enrolled to receive CT-guided lung biopsy. The use of an ULD protocol (axial scan) for CT-guided biopsy was initiated. Patients were randomly assigned to axial mode (Group A) and conventional helical mode (Group B) CT groups. 64-slice CT was performed for CT-guided pulmonary biopsy with an 18-G coaxial cutting biopsy needle. The radiation dose, accuracy, image quality, and complication rate were measured. Results Ninety-seven patients were selected for the final phase of the study. There was no significant difference between the two groups for pulmonary nodule characteristics ( P > 0.05). The mean effective dose in group A (0.077 ± 0.010 mSv) was significantly reduced relative to group B (0.653 ± 0.177 mSv, P < 0.001). There was no significant difference in accuracy, image quality, and complication rate ( P > 0.050) between the two modes. Conclusion An ULD protocol for CT-guided lung nodule biopsy yields a reduction in the radiation dose without significant change in the accuracy, image quality, and complication rate relative to the conventional helical mode scan.

scholarly journals New patient-controlled abdominal compression method in radiography: radiation dose and image quality

2018 ◽  
Vol 7 (5) ◽  
pp. 205846011877286 ◽  
Author(s):  
Oili Piippo-Huotari ◽  
Eva Norrman ◽  
Agneta Anderzén-Carlsson ◽  
Håkan Geijer
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Prone Position ◽  
Quality Criteria ◽  
Abdominal Compression ◽  
Radiographic Images ◽  
Dose Area Product ◽  
Similar Dose ◽  
Significant Difference ◽  
Area Product

Background The radiation dose for patients can be reduced with many methods and one way is to use abdominal compression. In this study, the radiation dose and image quality for a new patient-controlled compression device were compared with conventional compression and compression in the prone position . Purpose To compare radiation dose and image quality of patient-controlled compression compared with conventional and prone compression in general radiography. Material and Methods An experimental design with quantitative approach. After obtaining the approval of the ethics committee, a consecutive sample of 48 patients was examined with the standard clinical urography protocol. The radiation doses were measured as dose-area product and analyzed with a paired t-test. The image quality was evaluated by visual grading analysis. Four radiologists evaluated each image individually by scoring nine criteria modified from the European quality criteria for diagnostic radiographic images. Results There was no significant difference in radiation dose or image quality between conventional and patient-controlled compression. Prone position resulted in both higher dose and inferior image quality. Conclusion Patient-controlled compression gave similar dose levels as conventional compression and lower than prone compression. Image quality was similar with both patient-controlled and conventional compression and was judged to be better than in the prone position.

Abstract 690: Variability and Predictors of Patient Radiation Dose with Dual Source Cardiac CT: Implications for Future Algorithms to Reduce Patient Radiation Dose

Circulation ◽  
2008 ◽  
Vol 118 (suppl_18) ◽  
Author(s):  
Ron Blankstein ◽  
Rodrigo Pale ◽  
Khurram Nasir ◽  
Amar B Shah ◽  
Hiram Bezerra ◽  
...  
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Radiation Exposure ◽  
Medical Center ◽  
Pulmonary Veins ◽  
Wide Range ◽  
Significant Difference ◽  
Patient Radiation Exposure ◽  
Patient Radiation Dose ◽  
Scan Length

Intro : DSCT provides improved temporal resolution due to the simultaneous use of two x-ray sources & detectors. Although use of two sources may increase radiation, the DSCT offers key mechanisms to reduce dose (i.e. pitch adaptation, tube current modulation (TCM) & prospective triggering). Thus, our aim was to assess the patient radiation exposure associated with DSCT and identify variations based on the use of different scan related parameters. Methods : Prospective study of a single tertiary medical center where radiation and image quality related data was collected on 304 consecutive patients (pts) presenting for clinical CCT examination. Effective radiation dose was calculated by multiplying the dose-length product × (k=.017 mSv/mGy/cm). Image quality was rated on a subjective IQ score [1=poor to 4=excellent], as well as contrast (CNR) and signal-to-noise (SNR) ratios. Adjusted means of increased radiation dose were calculated based on linear regression models. Results: Among 304 consecutive studies (mean age 56.4, BMI 29.4 kg/m 2 , 37% Female), 60% were performed for coronary evaluation, 8% for CABG, 18% for pulmonary veins and 11% for aortic disease. The average radiation dose was 13.5±9.2mSv [range 0.5–55.5 mSv]. TABLE provides unadjusted and adjusted mean radiation dose for parameters which had a significant univariate association with radiation dose. Independent predictors of lower radiation included low kV, use of TCM, higher pitch, smaller scan length, and regular heart rhythm. Selected use of various TCM algorithms & low KV resulted in no significant difference in IQ, CNR, or SNR. Conclusions : DSCT is associated with a wide range of patient radiation exposure. The variability in dose is due to both controllable parameters (i.e. use of TCM, low kV, scan length) as well as parameters that cannot be altered (i.e. irregular rhythm). These results suggest that individualizing scan protocols may result in lower radiation dose without compromising image quality. Table: Cardiac DSCT Parameters Affecting Patient Radiation Dose

Subjective and objective evaluation of image quality in biplane cerebral digital subtraction angiography following significant acquisition dose reduction in a clinical setting

2016 ◽  
Vol 9 (3) ◽  
pp. 297-301 ◽  
Author(s):  
Amir R Honarmand ◽  
Ali Shaibani ◽  
Tamila Pashaee ◽  
Furqan H Syed ◽  
Michael C Hurley ◽  
...  
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Quality Assessment ◽  
Image Quality Assessment ◽  
Standard Dose ◽  
Objective Assessment ◽  
Objective Evaluation ◽  
Side Branch ◽  
Image Series ◽  
Significant Difference

ObjectiveDifferent technical and procedural methods have been introduced to develop low radiation dose protocols in neurointerventional examinations. We investigated the feasibility of minimizing radiation exposure dose by simply decreasing the detector dose during cerebral DSA and evaluated the comparative level of image quality using both subjective and objective methods.MethodsIn a prospective study of patients undergoing diagnostic cerebral DSA, randomly selected vertebral arteries (VA) and/or internal carotid arteries and their contralateral equivalent arteries were injected. Detector dose of 3.6 and 1.2 μGy/frame were selected to acquire standard dose (SD) and low dose (LD) images, respectively. Subjective image quality assessment was performed by two neurointerventionalists using a 5 point scale. For objective image quality evaluation, circle of Willis vessels were categorized into conducting, primary, secondary, and side branch vessels. Two blinded observers performed arterial diameter measurements in each category. Only image series obtained from VA injections opacifying the identical posterior intracranial circulation were utilized for objective assessment.ResultsNo significant difference between SD and LD images was observed in subjective and objective image quality assessment in 22 image series obtained from 10 patients. Mean reference air kerma and kerma area product were significantly reduced by 61.28% and 61.24% in the LD protocol, respectively.ConclusionsOur study highlights the necessity for reconsidering radiation dose protocols in neurointerventional procedures, especially at the level of baseline factory settings.

Dose reduction in thorax radiography in simulated neonates with additional filtration and digital luminescence radiography

1998 ◽  
Vol 39 (5) ◽  
pp. 514-519 ◽  
Author(s):  
H. Seifert ◽  
H.-J. Jesberger ◽  
G. Schneider ◽  
L. Rein ◽  
G. Blass ◽  
...  
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Dose Reduction ◽  
Quality Criteria ◽  
Current Time ◽  
Tube Current ◽  
Adequate Image Quality ◽  
Digital Luminescence Radiography ◽  
Test Phantom

Purpose: to determine the minimum acceptable radiation dose for an adequate image quality in thorax a.p. radiographs of neonates using mobile X-ray equipment Material and Methods: the influence of additional filtration (1.0 mm Al+0.1 mm Cu) on image quality and radiation dose was determined for the speed class 400 screen-film system (SFS) and digital luminescence radiography (DLR) by making radiographs of a test phantom. Conventional and digital thorax a.p. radiographs of a rabbit were produced using various tube current-time products. the quality of the rabbit radiographs was judged by eight radiologists applying image quality criteria according to the German guidelines and the recommendations of the European Community Results: the added filter resulted in a dose reduction of 39% at 66 kV. DLR gave a further dose reduction of 25% in comparison to the speed class 400 SFS while maintaining adequate image quality, i. e. the radiographs were clinically acceptable with regard to quality criteria Conclusion: the radiation dose resulting from thorax a.p. radiographs of neonates can be reduced by approximately 50% with the use of additional filtration and DLR

scholarly journals Comparison of image quality and radiation dose using different pre-ASiR-V and post-ASiR-V levels in coronary computed tomography angiography

2020 ◽  
pp. 1-10
Author(s):  
Yongxia Zhao ◽  
Dongxue Li ◽  
Zhichao Liu ◽  
Xue Geng ◽  
Tianle Zhang ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Image Quality ◽  
Radiation Dose ◽  
Computed Tomography Angiography ◽  
Coronary Computed Tomography Angiography ◽  
Effective Radiation Dose ◽  
Dose Length Product ◽  
Coronary Computed Tomography ◽  
Significant Difference ◽  
Noise Ratio

OBJECTIVE: To determine the optimal pre-adaptive and post-adaptive level statistical iterative reconstruction V (ASiR-V) for improving image quality and reducing radiation dose in coronary computed tomography angiography (CCTA). METHODS: The study was divided into two parts. In part I, 150 patients for CCTA were prospectively enrolled and randomly divided into 5 groups (A, B, C, D, and E) with progressive scanning from 40% to 80% pre-ASiR-V with 10% intervals and reconstructing with 70% post-ASiR-V. The signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) were calculated. Subjective image quality was assessed using a 5-point scale. The CT dose index volume (CTDIvol) and dose-length product (DLP) of each patient were recorded and the effective radiation dose (ED) was calculated after statistical analysis by optimizing for the best pre-ASiR-V value with the lowest radiation dose while maintaining overall image quality. In part II, the images were reconstructed with the recommended optimal pre-ASiR-V values in part I (D group) and 40%–90% of post-ASiR-V. The reconstruction group (D group) was divided into 6 subgroups (interval 10%, D0:40% post-ASiR-V, D1:50% post - ASiR-V, D2:60% post-ASiR-V, D3:70% post-ASiR-V, D4:80% post-ASiR-V, and D5:90% post-ASiR-V).The SNR and CNR of D0-D5 subgroups were calculated and analyzed using one-way analysis of variance, and the consistency of the subjective scores used the k test. RESULTS: There was no significant difference in the SNRs, CNRs, and image quality scores among A, B, C, and D groups (P > 0.05). The SNR, CNR, and image quality scores of the E group were lower than those of the A, B, C, and D groups (P < 0.05). The mean EDs in the B, C, and D groups were reduced by 7.01%, 13.37%, and 18.87%, respectively, when compared with that of the A group. The SNR and CNR of the D4–D5 subgroups were higher than the D0-D3 subgroups, and the image quality scores of the D4 subgroups were higher than the other subgroups (P < 0.05). CONCLUSION: The wide-detector combined with 70% pre-ASiR-V and 80% post-ASiR-V significantly reduces the radiation dose of CCTA while maintaining overall image quality as compared with the manufacture’s recommendation of 40% pre-ASiR-V.

scholarly journals Radiation Dose Reduction During Adrenal Vein Sampling Using a New Angiographic Noise Reduction Imaging Technology

2021 ◽  
Author(s):  
Clemens Spink ◽  
Maxim Avanesov ◽  
Alexander Lenz ◽  
Frank Oliver Henes ◽  
Lennart Well ◽  
...  
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Noise Reduction ◽  
Adrenal Vein ◽  
Fluoroscopy Time ◽  
Rank Test ◽  
Adrenal Vein Sampling ◽  
Imaging Technology ◽  
Significant Difference ◽  
Technology Upgrade

Abstract Purpose: To compare the patient radiation doses during angiographic selective adrenal vein sampling (AVS) before and after a noise reduction imaging technology upgrade.Methods: In this retrospective single-center-study, cumulative air kerma (AK), cumulative dose area product (DAP), fluoroscopy time and contrast agent dosage were recorded from 70 patients during AVS. 35 procedures were performed before and 35 after a noise reduction imaging processing technology upgrade. Mean values were calculated and compared using an unpaired student’s t-test. DSA image quality was assessed independently by two blinded readers using a four-point Likert scale (1=poor; 4=excellent) and compared using Wilcoxon signed-rank test.Results: After the technology upgrade we observed a significant reduction of 35% in AK (1.7±0.7 vs. 1.1±0.7 Gy, p=0.01) and a significant reduction of 28% in DAP (235.1±113 vs. 170.1±94 Gy*cm2, p=0.01) in comparison to procedures before the upgrade. There were no significant differences between the number of exposure frames (143±86 vs. 132±61frames, p=0.53), fluoroscopy time (42±23 vs. 36±18 min, p=0.22), or the amount of contrast medium used (179.5±84 vs. 198.1±109 ml, p=0.41). There was also no significant difference regarding image quality (3 (2-4) vs. 3 (2-4), p=0.67). ​Conclusion: The angiographic noise reduction imaging technology upgrade significantly decreases the radiation dose during adrenal vein sampling without increasing time of fluoroscopy or contrast volume and without compromising image quality.

scholarly journals Prospective Clinical Trial Comparing IV Esmolol to IV Metoprolol in CT Coronary Angiography: Effect on Hemodynamic, Technical Parameters and Cost

2021 ◽  
pp. 084653712110239
Author(s):  
Leena Robinson Vimala ◽  
Diego Andre Eifer ◽  
Yasser Karimzad ◽  
Narinder S. Paul
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Randomized Study ◽  
Hemodynamic Response ◽  
Cost Of Care ◽  
Technical Parameters ◽  
Institutional Review ◽  
Significant Difference ◽  
Prolonged Hypotension ◽  
Observation Period

Background: Intravenous [IV] esmolol, an alternative to IV metoprolol for coronary computed tomography angiography [CCTA], has shorter half-life that decreases the risk of prolonged hypotension. The primary aim was to prospectively compare IV esmolol alone to IV metoprolol alone for effectiveness in achieving heart rate [HR] of 60 beats per minute[bpm] during CCTA. The secondary aim was to compare hemodynamic response, image quality, radiation dose and cost. Materials and Methods: Institutional Review Board approved prospective randomized study of 28 CCTA patients medicated in a 1:1 blinded match with IV esmolol or IV metoprolol to achieve HR of 60 bpm. Serial hemodynamic response was measured at 6 specified times. Two cardiac radiologists independently scored the image quality. Results: Both IV esmolol and IV metoprolol achieved the target HR. IV esmolol resulted in significantly less profound and shorter duration of reduction in systolic blood pressure [BP] than IV metoprolol with a difference of -10, -14 and -9 mm Hg compared to -20, -26 and -25 mmHg at 2, 15 & 30 min respectively. No significant difference in HR at image acquisition, exposure window, radiation dose and image quality. Although IV esmolol was expensive, the overall cost of care was comparable to IV metoprolol due to shortened post CCTA observation period consequent to faster restoration of hemodynamic status. Conclusion: Comparison of IV esmolol and IV metoprolol demonstrate that both are effective in achieving the target HR but significantly faster recovery of HR and BP in patients who receive IV esmolol was found.

Advantages of Application of Whole-Body Low-Dose Computed Tomography in Multiple Myeloma

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Chen J ◽  
◽  
Li M ◽  
Gao Z ◽  
Liu S ◽  
...  
Keyword(s):  
Multiple Myeloma ◽  
Image Quality ◽  
Radiation Dose ◽  
Ct Scan ◽  
Reconstruction Algorithm ◽  
Objective Evaluation ◽  
Whole Body ◽  
Significant Difference ◽  
Group A ◽  
Group B

Aim: This study was designed to investigate the application of whole-body low-dose computed tomography in the examination of multiple myeloma. Method: 40 patients with multiple myeloma admitted to our hospital were prospectively selected as the study subjects. All patients were pathologically confirmed and/or clinically diagnosed with multiple myeloma. Patients were randomly divided into two groups: Group A (n=20) received whole-body lowdose CT scan with SAFIR iterative reconstruction algorithm; Group B (n=20) underwent whole body conventional dose CT scan combined with conventional reconstruction algorithm. The image quality was scored subjectively, and the objective evaluation indexes (including CT value and noise of neck, chest, abdomen, pelvic cavity and lower extremities, signal-to-noise ratio and image quality index) were measured and recorded, and the radiation dose was recorded. Mann-Whitney U test (to evaluate the subjective score) and t test (to evaluate the objective evaluation index and radiation dose) were used to compare the differences of the above indexes between group A and group B. Result: All the images met the diagnostic requirements. There was no statistical significance in the scores between group A and group B (P>0.05). Significant differences in CT value, noise and SNR of neck, chest, abdomen, pelvis and lower extremities between group A and group B (P<0.05) were identified. For the image quality index (figure of merit, FOM), the FOM of chest, abdomen and pelvis was not statistically significantly changed (P<0.05). The radiation dose of group A decreased by 56.77% (3.06/5.39) compared to group B with a statistically significant difference (P<0.05). The Kappa values of subjective scores of the two groups showed no statistically significant difference (respectively, 0.68 and o.69, P>0.05). Conclusion: Compared to conventional CT examination, whole-body lowdose CT scan combined with SAFIR iterative reconstruction algorithm can effectively reduce noise, reduce X-ray radiation dose, and obtain ideal image quality in multiple myeloma examination, which has a certain application value.

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