Image quality vs radiation dose for a flat-panel amorphous silicon detector: a phantom study

Geijer, Håkan; Beckman, Karl-Wilhelm; Andersson, Torbjörn; Persliden, Jan

doi:10.1007/s003300100851

Cited by 66 publications

(37 citation statements)

References 14 publications

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“…Effective measures include optimized source-object, source-image, and object-image distances, the avoidance of magnification and oblique projections, tight collimation to the relevant anatomy, the use of pulsed fluoroscopy with decreased image frequency, and the use of low frame rates or even last-image-hold to document angiographic endpoints [9,13]. Flat panel detectors improve image quality while reducing radiation exposure, and pre-interventional optimization of the tube angle by 3D-reconstructed contrast-enhanced MR angiography helps to avoid conventional survey aortography [11,22,23]. In particular, angiography units allowing the selection of lower pulse rates during fluoroscopy contribute to a significant reduction in the overall fluoroscopy time and the radiation dose exposure of patients undergoing UFE [9,24].…”

Section: Discussionmentioning

confidence: 99%

Radiation Exposure During Uterine Fibroid Embolization (UFE): A Confounder-Controlled Comparison Between a State-of-the-Art Angiography Unit and a Conventional Angiography unit

Sommer

Voigt

Oliger

et al. 2017

Fortschr Röntgenstr

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ZUSAMMENFASSUNGZiel Vergleich der Strahlenexposition zwischen einem modernen und einem konventionellen Angiografiesystem bei Patientinnen, die sich einer Uterusmyomembolisation (UME) unterzogen. Ergebnisse Die Einschlusskriterien wurden von 58 (Gruppe 1) bzw. 177 (Gruppe 2) Patientinnen erfüllt. Nach Propensity Score Matching ergaben sich keine signifikanten Unterschiede zwischen Gruppe 1 (n = 46) and Gruppe 2 (n = 92) bezüglich Alter, Body-Mass-Index, Volumen des dominanten Myoms, Uterusvolumen, Fluoroskopiezeit und Embolisatmenge (jeweils p ≥ 0,10). Das Dosisflächenprodukt war in Gruppe 1 signifikant geringer als in Gruppe 2 (1159,0 cGycm 2 vs. 3123,5 cGycm 2 ; p < 0,001), während die Major-Komplikationsrate (0 % in beiden Gruppen) und der Grad der Devaskularisation des dominanten Myoms (100 % in beiden Gruppen) vergleichbar waren (p > 0,99 Material und Methoden ABSTR AC TPurpose To compare radiation exposure of a state-of-the-art and a conventional angiography unit in patients undergoing uterine fibroid embolization (UFE). Materials and MethodsBetween January 2009 and December 2016, 286 patients underwent UFE in our Interdisciplinary Fibroid Center. The inclusion criteria for this retrospective analysis were first-time transarterial embolization for symptomatic fibroids, bilateral embolization, procedures applying a state-of-the-art (Group 1) or a conventional angiography unit (Group 2), and bilateral technical success with an adequate embolization endpoint after the injection of microspheres. Study endpoints included radiation exposure, major complications, morphological success (MRI), and clinical success (questionnaire on quality-of-life). Propensity score matching controlled for confounders.Results The inclusion criteria were met by 58 (Group 1) and 177 (Group 2) patients. After propensity score matching, there was no significant difference between Group 1 (n = 46) and Group 2 (n = 92) regarding age, body-mass index, volume of the dominant fibroid and the uterus, fluoroscopy time, and amount of embolic agent (p ≥ 0.10 each). The dose-area product was significantly lower in Group 1 than in Group 2 (1159.0 cGycm 2 vs. 3123.5 cGycm 2 ; p < 0.001), while major complication rates (both groups 0 %) and dominant fibroid devascularization (both groups 100 %) were equal (p > 0.99). There were no significant differences between both groups regarding shrinkage of the dominant fibroid and the uterus and no relevant differences regarding patient-reported quality-of-life.Conclusion A state-of-the-art angiography unit has the potential to reduce radiation exposure in patients undergoing UFE without increasing the risk of major complications and with comparably high morphological and clinical success.

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Section: Discussionmentioning

confidence: 99%

Radiation Exposure During Uterine Fibroid Embolization (UFE): A Confounder-Controlled Comparison Between a State-of-the-Art Angiography Unit and a Conventional Angiography unit

Sommer

Voigt

Oliger

et al. 2017

Fortschr Röntgenstr

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“…In the literature, there are several examples where CD phantoms have been used. 5,6 The evaluation is performed by letting human observers read and evaluate images of the phantom. From these evaluations, a graphical description of image quality, a contrast-detail curve (CD curve), can be obtained and a quantified measurement of image quality, the Image Quality Figure (IQF), can be calculated.…”

Section: Y3mentioning

confidence: 99%

“…It has been observed that, with CD phantom, there can also be large variations in subjective opinion regarding image quality between different observers. 6,7 At our Radiology department, the x-ray images are totally digitized. In the quality control program and optimization processes of this department, a matter of concern has been the ability to conduct image quality evaluations that would exclude human variations in the results.…”

Section: Y3mentioning

confidence: 99%

“…It has been reported that, for images of a contrast-detail phantom, there are no significant differences between radiologists and non-radiologists. 7 (2) Images used in a previous study, 6 which were evaluated by four human observers, two radiologists and two medical physicists. The evaluations performed by the human observers were compared to the computer evaluation.…”

Section: Radiographic Imagesmentioning

confidence: 99%

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A Clinical Evaluation of the Image Quality Computer Program, CoCIQ

et al. 2005

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To provide an objective way of measuring image quality, a computer program was designed that automatically analyzes the test images of a contrast-detail (CD) phantom. The program gives a quantified measurement of image quality by calculating an Image Quality Figure (IQF). The aim of this work was to evaluate the program and adjust it to clinical situations in order to find the detectable level where the program gives a reliable figure of the contrast resolution. The program was applied on a large variety of images with lumbar spine and urographic parameters, from very low to very high image qualities. It was shown that the computer program produces IQFs with small variations and there were a strong linear statistical relation between the computerized evaluation and the evaluation performed by human observers ( R 2 = 0.98). This method offers a fast and easy way of conducting image quality evaluations.

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“…Geijer, et al (2001Geijer, et al ( , 2002 and Jansson, et al (2006) Geijer (2002) also used this method to evaluate lower dose techniques for scoliosis radiography. A traditional screen-film, digital radiography, and digital fluoroscopy system were evaluated.…”

Section: The Image Quality Figure and Visual Grading Analysismentioning

confidence: 99%

Image Optimization in Digital Dental Radiography

Silverstrim¹,

Schneider²,

Hoeven³

2015

Health Physics

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When the United States Air Force completed a multi-million dollar transition to digital dental radiography in 2010 there was no quantitative method available for establishing the appropriate balance of image quality and radiation dose. The objective of this research was to devise a process to fill this need. Through computer simulation and clinical validation the effect of technical parameters on digital dental radiographic image quality was investigated and an optimization method was devised. The Monte Carlo NParticle Extended (MCNPX) radiation transport code was used to model the DC Planmeca Intra and AC Gendex 770 dental intraoral radiographic units and a unique anthropomorphic phantom simulating dental bitewing anatomy. The Carestream 6100 RVG sensor signal response, noise response, dose rate dependence and reproducibility were determined experimentally, as were their uncertainties and the inter-and intraradiographic unit variabilities. The experimental measurements were used to calibrate and scale the MCNPX generated data for the optimization analysis. The technical parameters modified in the simulation were peak kilovoltage, (50 through 90) and tube filtration (inherent, 0.1 mm and 0.2 mm added copper). The entrance air KERMA (~720 Gy) at the current clinical technique (63 kVp at 1 milliAmpere-seconds) was used to establish the reference image quality metrics for comparison. Four figures of merit (FOM) were chosen to encompass the impact of variations in the adjustable parameters.vii With equal weighting of all FOMs and given no limitations on the equipment, the optimal combination of kVp and tube filtration for dental bitewing imaging identified was 90 kVp with 0.1 mm added copper filtration. The optimal technique in the radiographic units' operating range was 70 kVp and 0.1 mm added copper filtration, which could be immediately adopted for a ~50% (+/-17%) entrance dose and ~40% effective dose savings (Planmeca units). In general, the optimization method facilitates image quality standardization across different radiographic units and sensors in a dental clinic. The unique computer model and optimization method used could be easily customized to evaluate any adult or pediatric intraoral imaging task. The results underscore the importance of tailoring the technical parameters to the particular imaging devices in service.viii Table of yet been achieved and it does not address digital dental radiography. However, the methods used for general radiology may serve as a guide.Several authors have reported techniques for image quality optimization. A number of these studies will be reviewed in an attempt to identify techniques that may be useful in digital dental imaging. Alternative approaches will also be explored.The dose versus image quality optimization process must be approached in several steps. First, a method must be identified to optimize the technical components of the imaging chain. That is, the appropriate radiographic technique for the chosen digital sensors must be determined with...

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Image quality vs radiation dose for a flat-panel amorphous silicon detector: a phantom study

Cited by 66 publications

References 14 publications

Radiation Exposure During Uterine Fibroid Embolization (UFE): A Confounder-Controlled Comparison Between a State-of-the-Art Angiography Unit and a Conventional Angiography unit

Radiation Exposure During Uterine Fibroid Embolization (UFE): A Confounder-Controlled Comparison Between a State-of-the-Art Angiography Unit and a Conventional Angiography unit

A Clinical Evaluation of the Image Quality Computer Program, CoCIQ

Image Optimization in Digital Dental Radiography

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