scholarly journals Influence of safety glasses, body height and magnification on the occupational eye lens dose during pelvic vascular interventions: a phantom study

2021 ◽  
Author(s):  
Alexander Gangl ◽  
Hannes Alexander Deutschmann ◽  
Rupert Horst Portugaller ◽  
Georg Stücklschweiger
Keyword(s):  
Scattered Radiation ◽  
Body Height ◽  
Eye Lens ◽  
Vascular Intervention ◽  
Thermoluminescent Dosimeters ◽  
Eye Lens Dose ◽  
Wide Range ◽  
False Sense ◽  
Protective Eyewear ◽  
Head Rotations

Abstract Objective By simulating a fluoroscopic-guided vascular intervention, two differently designed radiation safety glasses were compared. The impacts of changing viewing directions and body heights on the eye lens dose were evaluated. Additionally, the effect of variable magnification levels on the arising scattered radiation was determined. Methods A phantom head, replacing the operator’s head, was positioned at different heights and rotated in steps of 20° in the horizontal plane. Thermoluminescent dosimeters (TLD), placed in the left orbit of the phantom, detected eye lens doses under protected and completely exposed conditions. In a second step, radiation dose values with increasing magnification levels were detected by RaySafe i3 dosimeters. Results Changing eye levels and head rotations resulted in a wide range of dose reduction factors (DRF) from 1.1 to 8.5. Increasing the vertical distance between the scattering body and the protective eyewear, DRFs markedly decreased for both glasses. Significant differences between protection glasses were observed. Increasing magnification with consecutively decreasing FOV size variably reduced the dose exposure to the eye lens between 47 and 83%, respectively. Conclusion The safety glasses in the study effectively reduced the dose exposure to the eye lens. However, the extent of the protective effect was significant depending on eye levels and head rotations. This may lead to a false sense of safety for the medical staff. In addition, the application of magnification reduced the quantity of scattering dose significantly. To ensure safe working in the Cath-lab, additional use of protective equipment and the differences in design of protective eyewear should be considered. Key Points • Eye lens dose changes with physical size of the interventionist and viewing direction. • The use of magnification during fluoroscopic-guided interventions reduces scattered radiation.

Eye Lens Dosimetry in Interventional Radiology: Assessment With Dedicated Hp(3) Dosimeters

2020 ◽  
pp. 084653712091175
Author(s):  
Nassim-Albert Merrachi ◽  
Roxanne Bouchard-Bellavance ◽  
Pierre Perreault ◽  
Patrick Gilbert ◽  
Gilles Soulez ◽  
...  
Keyword(s):  
Interventional Radiology ◽  
Radiation Effects ◽  
Pearson Correlation ◽  
Outer Edge ◽  
Eye Lens ◽  
Full Time ◽  
Thermoluminescent Dosimeters ◽  
Eye Lens Dose ◽  
Pearson Coefficient ◽  
Highly Correlated

Purpose: To quantify eye lens dose in interventional radiology and assess whether neck dosimeter is a good surrogate to evaluate eye lens dosimetry. Methods: Radiation exposure was prospectively measured in 9 interventional radiologists between May and October 2017. Standard Hp(0,07) thermoluminescent dosimeters (TLDs) were worn at the neck outside the lead apron, and 2 dedicated eye lens Hp(3) TLDs were placed just above the eyes, one midline and another at the outer edge of the left eye. Correlations between eye lens and neck TLD doses were assessed with Pearson coefficient, and linear regression was used to predict eye lens dose from neck TLD values. Results: Eye lens dose without eye protection was 0.18 ± 0.11 (mean ± standard deviation; 0.08-0.41) mSv per workday and 35.3 ± 6.6 mSv (16.3-82.9) annually (200 workdays/year). Five (56%) radiologists exceeded the 20 mSv annual eye lens dose limit. Eye lens doses from left and central TLDs were 12.46 ± 3.02 and 9.29 ± 3.38 mSv, respectively ( P = .027). Mean eye lens (left and central) and neck TLD doses were 10.87 ± 2.67 and 16.56 ± 5.67 mSv, respectively ( P = .008). Pearson correlation coefficient between both eye lens TLD and between mean eye lens TLD and neck TLD doses were 0.91 and 0.92, respectively. Average of eye lens dose was 0.0179 + (0.5971 × neck dose). Conclusion: Full-time interventional radiologists are likely to suffer from deterministic radiation effects to the eye lens, especially on the left side. Neck TLD significantly overestimates eye lens dose. However, eye lens doses are highly correlated with neck doses and may be predicted from the neck TLD values.

The value of protective head cap and glasses in neurointerventional radiology

2015 ◽  
Vol 8 (7) ◽  
pp. 736-740 ◽  
Author(s):  
Marta Sans Merce ◽  
Amine M Korchi ◽  
Lisa Kobzeva ◽  
Jérôme Damet ◽  
Gorislav Erceg ◽  
...  
Keyword(s):  
Effective Dose ◽  
Correlation Coefficients ◽  
Whole Body ◽  
Eye Lens ◽  
Annual Dose ◽  
Eye Lens Dose ◽  
Occupational Dose ◽  
Protective Eyewear ◽  
The Mean ◽  
Area Product

BackgroundProtection of the head and eyes of the neurointerventional radiologist is a growing concern, especially after recent reports on the incidence of brain cancer among these personnel, and the revision of dose limits to the eye lens. The goal of this study was to determine typical occupational dose levels and to evaluate the efficiency of non-routine radiation protective gear (protective eyewear and cap). Experimental correlations between the dosimetric records of each measurement point and kerma area product (KAP), and between whole body doses and eye lens doses were investigated.MethodsMeasurements were taken using thermoluminescent dosimeters placed in plastic bags and worn by the staff at different places. To evaluate the effective dose, whole body dosimeters (over and under the lead apron) were used.ResultsThe mean annual effective dose was estimated at 0.4 mSv. Annual eye lens exposure was estimated at 17 mSv when using a ceiling shield but without protective glasses. The protective glasses reduced the eye lens dose by a factor of 2.73. The mean annual dose to the brain was 12 mSv; no major reduction was observed when using the cap. The higher correlation coefficients with KAP were found for the dosimeters positioned between the eyes (R2=0.84) and above the apron, and between the eye lens (R2=0.85) and the whole body.ConclusionsUnder the specific conditions of this study, the limits currently applicable were respected. If a new eye lens dose limit is introduced, our results indicate it could be difficult to comply with, without introducing additional protective eyewear.

HOW TO ESTABLISH AN ADEQUATE SYSTEM FOR EYE LENS DOSE MONITORING: A PROPOSAL FOR TYPICAL WORKPLACES

2019 ◽  
Author(s):  
R P Kollaard ◽  
E Carinou ◽  
M Ginjaume ◽  
L Struelens
Keyword(s):  
Eye Lens ◽  
Eye Lens Dose ◽  
Dose Monitoring

Surgeon eye lens dose monitoring in catheterization lab: A multi-center survey

2019 ◽  
Vol 60 ◽  
pp. 127-131 ◽  
Author(s):  
Margherita Betti ◽  
Lorenzo Nicola Mazzoni ◽  
Giacomo Belli ◽  
Luca Bernardi ◽  
Sara Bicchi ◽  
...  
Keyword(s):  
Eye Lens ◽  
Eye Lens Dose ◽  
Dose Monitoring

scholarly journals Intraoperative 2D C-arm and 3D O-arm in children: a comparative phantom study

2018 ◽  
Vol 12 (5) ◽  
pp. 550-557 ◽  
Author(s):  
M. Prod’homme ◽  
M. Sans-Merce ◽  
N. Pitteloud ◽  
J. Damet ◽  
P. Lascombes
Keyword(s):  
Radiation Exposure ◽  
Scattered Radiation ◽  
Intraoperative Imaging ◽  
Radiation Doses ◽  
Organ Doses ◽  
Thermoluminescent Dosimeters ◽  
Dose Rates ◽  
Absorbed Doses ◽  
Entrance Dose ◽  
Student’S T

Purpose Exposure to ionizing radiation is a concern for children during intraoperative imaging. We aimed to assess the radiation exposure to the paediatric patient with 2D and 3D imaging. Methods To evaluate the radiation exposure, patient absorbed doses to the organs were measured in an anthropomorphic phantom representing a five-year-old child, using thermoluminescent dosimeters. For comparative purposes, organ doses were measured using a C-arm for one minute of fluoroscopy and one acquisition with an O-arm. The cone-beam was centred on the pelvis. Direct and scattered irradiations were measured and compared (Student’s t-test). Skin entrance dose rates were also evaluated. Results All radiation doses were expressed in µGy. Direct radiation doses of pelvic organs were between 631.22 and 1691.87 for the O-arm and between 214.08 and 737.51 for the C-arm, and were not significant (p = 0.07). Close scattered radiation on abdominal organs were between 25.11 and 114.85 for the O-arm and between 8.03 and 55.34 for the C-arm, and were not significant (p = 0.07). Far scattered radiation doses on thorax, neck and head varied from 0.86 to 6.42 for the O-arm and from 0.04 to 3.08 for the C-arm, and were significant (p = 0.02). The dose rate at the skin entrance was 328.58 µGy.s−1 for the O-arm and 1.90 with the C-arm. Conclusion During imaging of the pelvis, absorbed doses for a 3D O-arm acquisition were higher than with one minute fluoroscopy with the C-arm. Further clinical studies comparing effective doses are needed to assess ionizing risks of the intraoperative imaging systems in children.

Type testing of a head band dosemeter for measuring eye lens dose in terms of HP(3)

2013 ◽  
Vol 157 (3) ◽  
pp. 430-436 ◽  
Author(s):  
P. J. Gilvin ◽  
S. T. Baker ◽  
N. J. Gibbens ◽  
G. H. Roberts ◽  
R. J. Tanner ◽  
...  
Keyword(s):  
Eye Lens ◽  
Eye Lens Dose ◽  
Head Band

Cross-sectional analysis: clinical presentation of children with persistently low ALP levels

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Oliver Semler ◽  
Carl-Joachim Partsch ◽  
Anibh Martin Das ◽  
Andreas Prechtl ◽  
Corinna Grasemann
Keyword(s):  
Motor Development ◽  
Serum Alkaline Phosphatase ◽  
Body Height ◽  
Patient Records ◽  
Cross Sectional ◽  
Clinical Presentations ◽  
Wide Range ◽  
Z Scores ◽  
Sectional Analysis ◽  
Specific Symptoms

Abstract Objectives Low activity of serum alkaline phosphatase (ALP) is a hallmark of hypophosphatasia (HPP), but low readings of ALP are not always recognized in clinical routine. Understanding the clinical presentations associated with low ALP may contribute to a timelier diagnosis of HPP. Methods Data from paediatric patients with low ALP, excluding patients in intensive care and with oncological/haematological disorders, were analysed. Most recent ALP values, previous diagnoses, medication and relevant symptoms were extracted from patient records at nine specialised centres and analysed descriptively. A relationship between body height and ALP values was scrutinised by linear regression. Results Of 370 children, 15 (4.1%) had a diagnosis of HPP. In the subgroup without a diagnosis of HPP, 241 (67.9%) out of 355 patients had one or more medical conditions known to be associated with low serum ALP. Of those, hypothyroidism, malnutrition and steroid administration were most frequent. Characteristic symptoms, particularly, short stature, muscle weakness and delay of motor development were more frequent and ALP values were lower in patients with documented HPP diagnosis compared to patients without diagnosis of HPP (Ø z-scores: −2.52) (interquartile range [IQR] = 0.20) vs. −1.96 (IQR = 0.87). A weak positive linear relationship between z-scores of ALP and body height was identified (p<0.001). Conclusions This analysis of paediatric patient records elucidates a wide range of disorders associated with low ALP activity. In case of additional specific symptoms, HPP should always be considered as a differential diagnosis.

Sign in / Sign up

Export Citation Format

Share Document