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.

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.

scholarly journals Lateralizing Asymmetry of Adrenal Imaging and Adrenal Vein Sampling in Patients With Primary Aldosteronism

2019 ◽  
Vol 3 (7) ◽  
pp. 1393-1402 ◽  
Author(s):  
Norio Wada ◽  
Yui Shibayama ◽  
Takashi Yoneda ◽  
Takuyuki Katabami ◽  
Isao Kurihara ◽  
...  
Keyword(s):  
Primary Aldosteronism ◽  
Diagnostic Techniques ◽  
Concordance Rate ◽  
Adrenal Vein ◽  
Ct Scans ◽  
Adrenal Vein Sampling ◽  
Adrenal Imaging ◽  
Significant Difference ◽  
Nodular Lesions ◽  
The Right

Abstract Context In patients with primary aldosteronism (PA), it remains unclear whether aldosterone-producing adenomas are likely to develop in the left or right adrenal gland. Objective To investigate left-right differences of PA laterality diagnoses via CT imaging and adrenal vein sampling (AVS). Design Retrospective, observational study. Patients From the Japan Primary Aldosteronism Study, 1493 patients with PA were enrolled who underwent CT and ACTH-stimulated AVS. Measurements Left or right adrenal nodular lesion distribution and laterality observed on CT scans and from AVS were noted. Results Both on CT scans and AVS, unilateral results were observed more frequently on the left side than on the right side (25.1% vs 15.4% and 17.3% vs 13.5%, respectively; P < 0.01for both diagnostic techniques). There was no significant difference in the concordance rate for CT and AVS between patients with left and right unilateral nodular lesions observed on CT scans (44.1% and 50.9%, respectively; P = 0.15). In patients with nodules <20 mm, the concordance rate was significantly greater on the right side than the left side (45.8% vs 56.4%; P = 0.03). In patients with bilateral results of AVS, unilateral nodular lesions were detected more frequently on the left side than the right side (17.8% vs 9.4%; P < 0.01). Conclusion These results suggest aldosterone-producing adenomas and nonfunctioning tumors are more likely to develop on the left side in patients with PA and that misdiagnosis of CT-based lateralization may occur more frequently on the left side.

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.

Image quality and radiation dose of low-tube-voltage CT with reduced contrast media for right adrenal vein imaging

2018 ◽  
Vol 98 ◽  
pp. 150-157 ◽  
Author(s):  
Yuki Takahashi ◽  
Hideki Ota ◽  
Kensuke Omura ◽  
Yutaka Dendo ◽  
Katharina Otani ◽  
...  
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Contrast Media ◽  
Adrenal Vein ◽  
Tube Voltage ◽  
Low Tube Voltage ◽  
Vein Imaging

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.

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