scholarly journals Feasibility of ultra-low radiation dose digital subtraction angiography: Preliminary study in a simplified cerebral angiography phantom

2019 ◽  
Vol 25 (5) ◽  
pp. 589-595 ◽  
Author(s):  
Jun Young Maeng ◽  
Yunsun Song ◽  
Yu Sub Sung ◽  
Tae-Il Kim ◽  
Deok Hee Lee ◽  
...  
Keyword(s):  
Radiation Dose ◽  
Digital Subtraction Angiography ◽  
Cerebral Angiography ◽  
Signal To Noise Ratio ◽  
Standard Protocol ◽  
Digital Subtraction ◽  
Image Sharpness ◽  
Low Radiation Dose ◽  
Entrance Dose ◽  
Noise Ratio

Introduction The objective of this article is to evaluate the feasibility of cerebral digital subtraction angiography (DSA) using ultra-low radiation dose settings in a simplified cerebral angiography phantom. Materials and methods We created a silicone phantom capable of producing a simplified cerebral DSA. A total of 18 DSA sets were obtained with gradual six-step reduction of the detector entrance dose (DED) from 1.82 to 0.08 μGy per frame, while standard, postprocessing algorithm (PPA) and copper filter (0.3 mm) with PPA (CwP) algorithm reconstruction protocols were applied. We quantitatively compared their signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) and qualitatively analyzed the images' qualities in terms of image sharpness, contrast, and noise as investigated by five observers. Results The SNR and CNR, which decreased with lowering of the DED in the standard protocol group, were significantly compensated by using the PPA. The values were approximately double in the PPA (11.5 ± 2.9) and CwP (11.0 ± 2.5) groups compared with the standard (5.4 ± 1.1) group in the DED of 0.24 μGy per frame as well as in the other values. The total scores of the observers according to the protocols showed a tendency to decrease as the DED lowered. On average, the PPA (96.3 ± 34.6) and CwP (91.3 ± 29.9) groups yielded higher results than the standard protocol (83.7 ± 46.7). Conclusion Given that the current DED ranges from 1.82 to 3.60 μGy per frame for routine cerebral DSA, our results indicate that DED can be decreased to 15%–30% of the current dose level in vessels 2–4 mm in diameter if image-improvement algorithms are applied.

Ultra low radiation dose digital subtraction angiography (DSA) imaging using low rank constraint

2015 ◽  
Author(s):  
Kai Niu ◽  
Yinsheng Li ◽  
Sebastian Schafer ◽  
Kevin Royalty ◽  
Yijing Wu ◽  
...  
Keyword(s):  
Radiation Dose ◽  
Digital Subtraction Angiography ◽  
Low Rank ◽  
Digital Subtraction ◽  
Low Radiation Dose ◽  
Rank Constraint

Estimation of High Framerate Digital Subtraction Angiography Sequences at Low Radiation Dose

2021 ◽  
pp. 171-180
Author(s):  
Nazim Haouchine ◽  
Parikshit Juvekar ◽  
Xin Xiong ◽  
Jie Luo ◽  
Tina Kapur ◽  
...  
Keyword(s):  
Radiation Dose ◽  
Digital Subtraction Angiography ◽  
Digital Subtraction ◽  
Low Radiation Dose ◽  
Angiography Sequences

Estimated radiation dose according to the craniocaudal angle in cerebral digital subtraction angiography: Patient and phantom study

2019 ◽  
Vol 46 (6) ◽  
pp. 345-350 ◽  
Author(s):  
Yunsun Song ◽  
Youngeun Kim ◽  
Seongsik Han ◽  
Tae Il Kim ◽  
Joon Ho Choi ◽  
...  
Keyword(s):  
Radiation Dose ◽  
Digital Subtraction Angiography ◽  
Phantom Study ◽  
Digital Subtraction

Analysis of radiation doses incurred during diagnostic cerebral angiography after the implementation of dose reduction strategies

2016 ◽  
Vol 9 (4) ◽  
pp. 384-388 ◽  
Author(s):  
Tanja Schneider ◽  
Emily Wyse ◽  
Monica S Pearl
Keyword(s):  
Radiation Dose ◽  
Dose Reduction ◽  
Cerebral Angiography ◽  
Pediatric Patients ◽  
Radiation Doses ◽  
Digital Subtraction ◽  
Air Kerma ◽  
Reduction Strategies ◽  
Technical Modifications ◽  
Area Product

BackgroundOne goal of increasing awareness of radiation dose is to encourage personal and technical modifications in order to reduce the radiation exposure of patients and staff.ObjectiveTo analyze the radiation doses incurred during diagnostic cerebral angiography and the angiographic techniques practiced over a 4-year period, in order to demonstrate the effectiveness of implementing radiation dose reduction strategies.MethodsA retrospective review of the first 50 consecutive adult and pediatric patients undergoing diagnostic cerebral angiography each year from 2010 to 2013 was performed. Angiograms and procedure examination protocols were reviewed for patient age, gender, diagnosis, angiography techniques, fluoroscopy time, reference point air kerma (Ka,r in mGy), and kerma-area product (PKA in μGym2).ResultsFrom January 2010 to June 2013, a total of 231 diagnostic cerebral angiograms were reviewed (200 adults, 31 children). Adult patients were aged from 19 to 94 years and included 77 men and 123 women. Pediatric patients were aged from 2 to 18 years and comprised 11 boys and 20 girls. Median Ka,r and PKA significantly decreased from 2010 to 2013 in adults (1867 mGy; 21 231 µGym2 vs 653 mGy; 7860 µGym2) and children (644 mGy; 6495 µGym2 vs138 mGy; 1465 µGym2), (p<0.001).ConclusionsIncreased awareness and implementation of dose reduction strategies resulted in decreased radiation doses for diagnostic cerebral angiography both in adult and pediatric patients. The use of lower and variable digital subtraction angiography frame rates and tailored examinations contributed significantly to the reduced radiation doses observed during diagnostic cerebral angiography.

scholarly journals Initial Clinical Trial of Robot of Endovascular Treatment with Force Feedback and Cooperating of Catheter and Guidewire

2018 ◽  
Vol 2018 ◽  
pp. 1-10
Author(s):  
Yuhua Jiang ◽  
Keyun Liu ◽  
Youxiang Li
Keyword(s):  
Clinical Trial ◽  
Clinical Practice ◽  
Endovascular Treatment ◽  
Digital Subtraction Angiography ◽  
Cerebral Angiography ◽  
Force Feedback ◽  
Digital Subtraction ◽  
Robot System ◽  
Bilateral Carotid ◽  
Blood Routine

To evaluate the feasibility and safety of the robot of endovascular treatment (RobEnt) in clinical practice, we carried out a cerebral angiography using this robot system. We evaluated the performance of application of the robot system to clinical practice through using this robotic system to perform the digital subtraction angiography for a patient who was suspected of suffering intracranial aneurysm. At the same time, through comparing the postoperative head nuclear magnetic and blood routine with the preoperative examination, we evaluated the safety of application of the robot system to clinical practice. We performed the robot system to complete the bilateral carotid artery and bilateral vertebral arteriography. The results indicate that there was no obvious abnormality in the patient’s cerebral artery. No obvious abnormality was observed in the examination of patients’ check-up, head nuclear magnetism, and blood routine after the digital subtraction angiography. From this clinical trial, it can be observed that the robot system can perform the operation of cerebral angiography. The robot system can basically complete the related observation indexes, and its accuracy, effectiveness, stability, and safety basically meet the requirements of clinical application in neurointerventional surgery.

scholarly journals Transient Cortical Blindness after Digital Subtraction Angiography of Cerebral Vessels

2017 ◽  
Vol 14 (2) ◽  
pp. 36-38
Author(s):  
Shreeya Parajuli ◽  
Pravesh Rajbhandari ◽  
Sameer Acharya ◽  
Basant Pant
Keyword(s):  
Carotid Artery ◽  
Digital Subtraction Angiography ◽  
Cerebral Angiography ◽  
Carotid Artery Stenosis ◽  
Cortical Blindness ◽  
Artery Stenosis ◽  
Cerebral Vessels ◽  
Digital Subtraction ◽  
Transient Cortical Blindness ◽  
Rule Out

Transient blindness following cerebral angiography is a rare but known entity. We report a case of transient cortical blindness after cerebral angiography. The patient presented with is chemic stroke and the angiography was performed to rule out carotid artery stenosis. The patient, however, gradually regained his vision over a period of 3 days. This article is to understand one of the most unusual complications that may occur while performing angiography Nepal Journal of Neuroscience, Vol. 14, No. 2,  2017 Page: 36-38

scholarly journals Image Quality and Radiation Dose for Fibrofatty Breast using Target/filter Combinations in Two Digital Mammography Systems

2020 ◽  
Vol 10 ◽  
pp. 56
Author(s):  
Khaled Alkhalifah ◽  
Akram Asbeutah ◽  
Ajit Brindhaban
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Digital Mammography ◽  
High Performance ◽  
Signal To Noise Ratio ◽  
Filter Material ◽  
Skin Dose ◽  
Tissue Equivalent ◽  
Entrance Skin Dose ◽  
Noise Ratio

Objectives: The aim of this study was to determine the optimum combinations of target and filter materials for various X-ray tube voltage settings, as well as their effects on image quality and radiation dose. This was done using different digital mammography (DM) imaging systems with a breast equivalent phantom. Material and Methods: Two DM units with a tungsten (W) target, silver (Ag), and rhodium (Rh) filters and dual molybdenum (Mo) and Rh targets/filters were used. A tissue-equivalent mammography phantom of 6 cm thickness equivalent to a fibrofatty breast was exposed 20 times to different target/filter material combinations (W/Rh, W/Ag, Rh/Rh, Mo/Rh, and Mo/Mo) and various kV settings (28–34 kV). The signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) were calculated for each exposure. Results: The W/Ag combination resulted in the lowest entrance skin dose and mean glandular dose (MGD). The MGD for the W/Rh combination was 60% less than that of the W/Ag combination at 34 kV (P < 0.05). There was a direct relationship in the SNR with the Mo/Mo, Mo/Rh, and Rh/Rh combinations and an inverse relationship with the CNR in the 34 kV range. There were statistically significant differences between all five target/filter combinations, and the best SNR and CNR were observed for the W/Rh combination with a reduced radiation dose in the range of 28–30 kV (P < 0.05). Conclusion: For a breast thicknesses of 6 cm with a fibrofatty nature, the W/Rh combination delivers high performance in terms of image quality at a lower dose.

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