Establishment of dosimetric references in terms of dose-area product for small sizes MV X-ray beams

2015 ◽  
Vol 31 ◽  
pp. e52-e53 ◽  
Author(s):  
M. Le Roy ◽  
S. Dufreneix ◽  
J. Daures ◽  
F. Delaunay ◽  
J. Gouriou ◽  
...  
Keyword(s):  
X Ray ◽  
Dose Area Product ◽  
Area Product

scholarly journals Clinical apparatus for the reduction of dose area product for patients undergoing x-ray catheterization

2015 ◽  
Vol 42 (1) ◽  
pp. 521-530 ◽  
Author(s):  
Normand Robert ◽  
Kristina N. Watt ◽  
Sophie Rochette ◽  
Lionel Desponds ◽  
Régis Vaillant ◽  
...  
Keyword(s):  
X Ray ◽  
Dose Area Product ◽  
Area Product

scholarly journals Measurement of Area of Surplus X-ray Radiation by Dose-area Product Meter at Image Intensifier in Angiography X-ray Units

2006 ◽  
Vol 62 (7) ◽  
pp. 990-996 ◽  
Author(s):  
Shigenobu Seguchi ◽  
Takaya Saijou ◽  
Tatsuji Nagao ◽  
Yoshinobu Ishikawa ◽  
Shouta Mizuno ◽  
...  
Keyword(s):  
Image Intensifier ◽  
X Ray ◽  
Dose Area Product ◽  
Area Product

scholarly journals SPOT REGION OF INTEREST IMAGING: A NOVEL FUNCTIONALITY AIMED AT X-RAY DOSE REDUCTION IN NEUROINTERVENTIONAL PROCEDURES

2020 ◽  
Vol 188 (3) ◽  
pp. 322-331
Author(s):  
Ljubisa Borota ◽  
Andreas Patz
Keyword(s):  
Dose Reduction ◽  
Region Of Interest ◽  
Skin Dose ◽  
X Ray ◽  
Dose Area Product ◽  
Dose Saving ◽  
Area Product ◽  
Anatomical Area ◽  
Neurointerventional Procedures ◽  
Peak Skin Dose

Abstract Aim of the study: The aim of this study was to describe a new functionality aimed at X-ray dose reduction, referred to as spot region of interest (Spot ROI) and to compare it with existing dose-saving functionalities, spot fluoroscopy (Spot F), and conventional collimation (CC). Material and methods: Dose area product, air kerma, and peak skin dose were measured for Spot ROI, Spot F, and CC in three different fields of view (FOVs) 20 × 20 cm, 15 × 15 cm, and 11 × 11 cm using an anthropomorphic head phantom RS-230T. The exposure sequence was 5 min of pulsed fluoroscopy (7.5 pulses per s) followed by 7× digital subtraction angiography (DSA) runs with 30 frames per DSA acquisition (3 fps × 10 s). The collimation in Spot F and CC was adjusted such that the size of the anatomical area exposed was as large as the Spot ROI area in each FOV. Results: The results for all FOVs were the following: for the fluoroscopy, all measured parameters for Spot ROI and Spot F were lower than corresponding values for CC. For DSA and DSA plus fluoroscopy, all measured parameters for Spot ROI were lower than corresponding parameters for Spot F and CC. Conclusion: Spot ROI is a promising dose-saving technology that can be applied in fluoroscopy and acquisition. The biggest benefit of Spot ROI is its ability to keep the entire FOV information always visible.

Monte Carlo simulation-based feasibility study of a dose-area product meter built into a collimator for diagnostic X-ray

2013 ◽  
Vol 162 (3) ◽  
pp. 421-426 ◽  
Author(s):  
Y. Yoon ◽  
H. Kim ◽  
M. Park ◽  
J. Kim ◽  
D. Seo ◽  
...  
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Feasibility Study ◽  
X Ray ◽  
Dose Area Product ◽  
Simulation Based ◽  
Area Product

scholarly journals Calibration Examination of Dose Area Product Meters using X-ray

2017 ◽  
Vol 11 (1) ◽  
pp. 37-42 ◽  
Author(s):  
Jae Eun Jung ◽  
Do-Yeon Won ◽  
Hong-Moon Jung ◽  
Dae Cheol Kweon
Keyword(s):  
X Ray ◽  
Dose Area Product ◽  
Area Product

scholarly journals Combining Optimized Image Processing With Dual Axis Rotational Angiography: Toward Low‐Dose Invasive Coronary Angiography

2020 ◽  
Vol 9 (13) ◽  
Author(s):  
Dimitri Buytaert ◽  
Benny Drieghe ◽  
Frédéric Van Heuverswyn ◽  
Jan De Pooter ◽  
Peter Gheeraert ◽  
...  
Keyword(s):  
Coronary Angiography ◽  
Radiation Exposure ◽  
Effective Dose ◽  
Low Dose ◽  
Conversion Factor ◽  
Invasive Coronary Angiography ◽  
X Ray ◽  
Dose Area Product ◽  
Dose Conversion Factor ◽  
Area Product

Background Dual axis rotational coronary angiography ( DARCA ) reduces radiation exposure during coronary angiography on older x‐ray systems. The purpose of the current study is to quantify patient and staff radiation exposure using DARCA on a modality already equipped with dose‐reducing technology. Additionally, we assessed applicability of 1 dose area product to effective dose conversion factor for both DARCA and conventional coronary angiography ( CCA ) procedures. Methods and Results Twenty patients were examined using DARCA and were compared with 20 age‐, sex‐, and body mass index–matched patients selected from a prior study using CCA on the same x‐ray modality. All irradiation events are simulated using PCXMC ( STUK , Finland) to determine organ and effective doses. Moreover, for DARCA each frame is simulated. Staff dose is measured using active personal dosimeters (DoseAware, Philips Healthcare, The Netherlands). With DARCA , median cumulative dose area product is reduced by 57% (ie, 7.41 versus 17.19 Gy·cm 2 ). Effective dose conversion factors of CCA and DARCA are slightly different, yet this difference is not statistically significant. The occupational dose at physician's chest, leg, and collar level are reduced by 60%, 56%, and 16%, respectively, of which the first 2 reached statistical significance. Median effective dose is reduced from 4.75 mSv in CCA to 2.22 mSv in DARCA procedures, where the latter is further reduced to 1.79 mSv when excluding ventriculography. Conclusions During invasive coronary angiography, DARCA reduces radiation exposure even further toward low‐dose values on a system already equipped with advanced image processing and noise reduction algorithms. For both DARCA and CCA procedures, using 1 effective dose conversion factor of 0.30 mSv·Gy −1 ·cm −2 is feasible.

scholarly journals Radiography student comparison performing lumbar and thoracic spine imaging

2020 ◽  
Author(s):  
Nejc Mekiš ◽  
Rebeka Viltužnik
Keyword(s):  
Lumbar Spine ◽  
Effective Dose ◽  
Success Rate ◽  
Rejection Rate ◽  
X Ray ◽  
Dose Area Product ◽  
Spine Imaging ◽  
Study Results ◽  
Thoracic And Lumbar Spine ◽  
Area Product

Introduction: General radiography is a common imaging technique and X-ray examinations of the thoracic and lumbar spine are among the most frequent procedures undertaken. The aim of this research was to investigate the success rate, dose-area product (DAP), and effective dose values of 1st and 2nd cycle radiographer students performing X-ray imaging of the thoracic and lumbar spine using a phantom. Methods: The students were divided into four groups according to the year of study (1st, 2nd, and 3rd years of 1st cycle degree, and all 2nd cycle degree students). They were asked to perform imaging of thoracic and lumbar spine on the phantom in both anteroposterior and lateral projections where IQ and DAP measurements were collated. The study was blind, so they did not know about the purpose of the study. Results: First, we have inspected the acceptability rate of the images performed. The highest success rate of performing an optimal image was discovered with the 2nd cycle degree students where the 1st year students had the most difficulties there. In the second part, DAP and effective dose values were compared, only for the acceptable images in which case the 1st and 2nd years, students of the 1st cycle degree were most successful. Conclusion: Based on that, we can conclude, that the 2nd cycle degree students had the lowest rejection rate regarding the optimal image quality, which was the price of using a larger primary X-ray field which leads to higher dose values.

ESTIMATION OF ORGAN DOSES AND EFFECTIVE DOSES BASED ON IN-PHANTOM DOSIMETRY FOR INFANT DIAGNOSTIC CARDIAC CATHETERISATIONS WITH NOVEL X-RAY IMAGING TECHNOLOGY

2018 ◽  
Vol 183 (4) ◽  
pp. 529-534
Author(s):  
Toshio Kawasaki ◽  
Masami Sakakubo ◽  
Kanako Ito
Keyword(s):  
Effective Dose ◽  
Cardiac Catheterisation ◽  
Organ Doses ◽  
Conversion Factors ◽  
X Ray ◽  
Dose Area Product ◽  
X Ray Imaging ◽  
Effective Doses ◽  
The Mean ◽  
Area Product

Abstract The present study evaluated the organ and effective doses in infant diagnostic cardiac catheterisation performed using a modern x-ray imaging unit by in-phantom dosimetry. In addition, conversion factors from dose–area product (DAP) to effective dose were determined. The organ and effective doses in 1-year old during diagnostic cardiac catheterisations were measured using radiophotoluminescence glass dosemeters implanted into an infant anthropomorphic phantom. The mean effective doses, evaluated according to the International Commission on Radiologic Protection Publication 103, were 4.0 mSv (range: 1.5–8.7 mSv). The conversion factors from DAP to effective dose were 2 and 3.5 mSv (Gy cm2)−1 for posteroanterior and lateral fluoroscopy, respectively, and 1.8 and 3.3 mSv (Gy cm2)−1 for posteroanterior and lateral cineangiography, respectively. The dose data and conversion factors evaluated in the present study may be useful for estimating radiation exposure in infants during diagnostic cardiac catheterisation.

Analysis of Patients’ X-ray Exposure in 146 Percutaneous Radiologic Gastrostomies

2017 ◽  
Vol 189 (09) ◽  
pp. 820-827 ◽  
Author(s):  
Tim-Ole Petersen ◽  
Martin Reinhardt ◽  
Jochen Fuchs ◽  
Dieter Gosch ◽  
Alexey Surov ◽  
...  
Keyword(s):  
Cone Beam Ct ◽  
Image Intensifier ◽  
Flat Panel ◽  
Flat Detector ◽  
Dose Length Product ◽  
X Ray ◽  
Dose Area Product ◽  
Flat Panel Detector ◽  
Significant Prolongation ◽  
Area Product

Purpose Analysis of patient´s X-ray exposure during percutaneous radiologic gastrostomies (PRG) in a larger population. Materials and Methods Data of primary successful PRG-procedures, performed between 2004 and 2015 in 146 patients, were analyzed regarding the exposition to X-ray. Dose-area-product (DAP), dose-length-product (DLP) respectively, and fluoroscopy time (FT) were correlated with the used x-ray systems (Flatpanel Detector (FD) vs. Image Itensifier (BV)) and the necessity for periprocedural placement of a nasogastric tube. Additionally, the effective X-ray dose for PRG placement using fluoroscopy (DL), computed tomography (CT), and cone beam CT (CBCT) was estimated using a conversion factor. Results The median DFP of PRG-placements under fluoroscopy was 163 cGy*cm2 (flat panel detector systems: 155 cGy*cm2; X-ray image intensifier: 175 cGy*cm2). The median DLZ was 2.2 min. Intraprocedural placement of a naso- or orogastric probe (n = 68) resulted in a significant prolongation of the median DLZ to 2.5 min versus 2 min in patients with an already existing probe. In addition, dose values were analyzed in smaller samples of patients in which the PRG was placed under CBCT (n = 7, median DFP = 2635 cGy*cm2), or using CT (n = 4, median DLP = 657 mGy*cm). Estimates of the median DFP and DLP showed effective doses of 0.3 mSv for DL-assisted placements (flat panel detector 0.3 mSv, X-ray image converter 0.4 mSv), 7.9 mSv using a CBCT – flat detector, and 9.9 mSv using CT. This corresponds to a factor 26 of DL versus CBCT, or a factor 33 of DL versus CT. Conclusion In order to minimize X-ray exposure during PRG-procedures for patients and staff, fluoroscopically-guided interventions should employ flat detector systems with short transmittance sequences in low dose mode and with slow image frequency. Series recordings can be dispensed with. The intraprocedural placement of a naso- or orogastric probe significantly extends FT, but has little effect on the overall dose of the intervention. Due to the significantly higher X-ray exposure, the use of a CBCT as well as PRG-placements using CT should be limited to clinically absolutely necessary exceptions with strict indication. Key Points  Citation Format

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