Can Scatter Correction Software Replace a Grid in DR Pelvic Examinations?

Precht, Helle; Mørup, Svea Deppe; Tingberg, Anders; Outzen, Claus Bjørn; Kusk, Kirsten Weber; R, Nielsen; Midtgård, Marie; Winther, Martin Brændegaard; Waaler, Dag; Kusk, Martin Weber

doi:10.1093/rpd/ncz129

Cited by 12 publications

(10 citation statements)

References 11 publications

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“…Evaluation of the quality of the phantom images was obtained using absolute VGA as a measure of subjective image quality [30,31]. The results of the VGA analysis can be compiled in a score by applying the following equation [17,31]:…”

Section: Image Quality Assessmentmentioning

confidence: 99%

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Visual Evaluation of Image Quality of a Low Dose 2D/3D Slot Scanner Imaging System Compared to Two Conventional Digital Radiography X-ray Imaging Systems

et al. 2021

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The purpose of this study was to assess the image quality of the low dose 2D/3D slot scanner (LDSS) imaging system compared to conventional digital radiography (DR) imaging systems. Visual image quality was assessed using the visual grading analysis (VGA) method. This method is a subjective approach that uses a human observer to evaluate and optimise radiographic images for different imaging technologies. Methods and materials: ten posterior-anterior (PA) and ten lateral (LAT) images of a chest anthropomorphic phantoms and a knee phantom were acquired by an LDSS imaging system and two conventional DR imaging systems. The images were shown in random order to three (chest) radiologists and three experienced (knee) radiographers, who scored the images against a number of criteria. Inter- and intraobserver agreement was assessed using Fleiss’ kappa and weighted kappa. Results: the statistical comparison of the agreement between the observers showed good interobserver agreement, with Fleiss’ kappa coefficients of 0.27–0.63 and 0.23–0.45 for the chest and knee protocols, respectively. Comparison of intraobserver agreement also showed good agreement with weighted kappa coefficients of 0.27–0.63 and 0.23–0.45 for the chest and knee protocols, respectively. The LDSS imaging system achieved significantly higher VGA image quality compared to the DR imaging systems in the AP and LAT chest protocols (p < 0.001). However, the LDSS imaging system achieved lower image quality than one DR system (p ≤ 0.016) and equivalent image quality to the other DR systems (p ≤ 0.27) in the knee protocol. The LDSS imaging system achieved effective dose savings of 33–52% for the chest protocol and 30–35% for the knee protocol compared with DR systems. Conclusions: this work has shown that the LDSS imaging system has the potential to acquire chest and knee images at diagnostic quality and at a lower effective dose than DR systems.

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Section: Image Quality Assessmentmentioning

confidence: 99%

“…where S c = the given individual scores for observer (O) and image (I), N i = total number of images, and N o = total number of observers. Absolute VGA in the chest and knee protocols was scored using a five-point scale ranging from poor to excellent image quality (Table 3) [14,17,19,30,32,33].…”

Section: Image Quality Assessmentmentioning

confidence: 99%

Visual Evaluation of Image Quality of a Low Dose 2D/3D Slot Scanner Imaging System Compared to Two Conventional Digital Radiography X-ray Imaging Systems

et al. 2021

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“…Again, a smaller collimation field corresponds with a slight increase in the VGA score. This was seen in a study by Precht et al ( 19 ), showing that the scatter radiation had a negative impact on the image contrast because the scatter radiation strikes the image plate without structural tissue information ( 19 ). In this study, however, this relationship between collimation and image quality is not seen to a statistically significant degree.…”

Section: Discussionmentioning

confidence: 90%

Collimation and Exposure Parameter Influence Image Quality and Potential Radiation Dose to the Eye Lens of Personnel in Computed Radiography of the Canine Pelvis

et al. 2021

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Introduction: The purpose of this study was to evaluate the effect of collimation on image quality and radiation dose to the eye lenses of the personnel involved in computed radiography of the canine pelvis.Materials and Methods: A retrospective study of canine pelvic radiographs (N = 54) was undertaken to evaluate the relationship between image quality and the degree of field the collimation used. This was followed by a prospective cadaver study (N = 18) that assessed the effects on image quality and on scattered radiation dose of different collimation field areas and exposure parameters. All radiographs were analyzed for image quality using a Visual Grading Analysis (VGA) with three observers. Finally, the potential scattered radiation dose to the eye lens of personnel restraining a dog for pelvic radiographs was measured.Results: The retrospective study showed a slightly better (statistically non-significant) VGA score for the radiographs with optimal collimation. Spatial and contrast resolution and image sharpness showed the greatest improvement in response to minimizing the collimation field. The prospective study showed slightly better VGA scores (improved image quality) with the optimal collimation. Increasing the exposure factors especially the tube current and exposure time (mAs) resulted in improved low contrast resolution and less noise in the radiographs. The potential eye lens radiation dose increased by 14, 28, and 40% [default exposures, increased the tube peak potential (kVp), increased mAs, respectively] as a result of reduced collimation (increased beam size).Conclusion: The degree of collimation has no statistically significant on image quality in canine pelvic radiology for the range of collimation used but does have an impact on potential radiation dose to personnel in the x-ray room. With regard to radiation safety, increases in kVp are associated with less potential scatter radiation exposure compared to comparable increases in mAs.

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“…To overcome these practical constraints, several scatter correction post-processing algorithms (SCA) have been developed for use with portable radiography units, intending to reduce the effects of scattered radiation on IQ, including the Philips “Skyflow” [ 19 – 23 ], Fuji “Virtual Grid Software” [ 24 – 26 ], and Shimadzu SCA [ 27 ]. The detailed technical information in the Shimadzu SCA “White-Paper” is limited.…”

Section: Introductionmentioning

confidence: 99%

Efficacy of the scatter correction algorithm in portable chest radiography

et al. 2022

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Purpose Portable chest radiographs (CXRs) continue to be a vital diagnostic tool for emergency and critical care medicine. The scatter correction algorithm (SCA) is a post-processing algorithm aiming to reduce scatter within portable images. This study aimed to assess whether the SCA improved image quality (IQ) in portable CXRs. Methods Objective and subjective IQ assessments were undertaken on both phantom and clinical images, respectively. For objective analysis, attenuators were placed on the anterior surface of the patient’s thorax to simulate pathologies present within uniform regions of the phantom’s lung and heart. Phantom CXRs were acquired with three different tube-current-times (mAs). Phantom images were processed with different SCA strengths. Contrast to noise ratios (CNR) within the attenuator were determined for each algorithm strength and compared to non-SCA images. For subjective analysis, two independent radiologists graded 30 clinical images with and without the SCA activated. The images were graded for IQ in different anatomical structures and overall diagnostic confidence. Results Objectively, most strengths of the SCA improved the CNR in both regions. However, a detrimental effect was recorded for some algorithm strengths in regions of high contrast. Subjectively, both observers recorded the SCA significantly improved IQ in clinical CXRs in all anatomical regions. Observers indicated the greatest improvement in the lung and hilar regions, and least improvement in the chest wall and bone. All images with and without the SCA were deemed diagnostic. Conclusion This study shows the potential radiation dose neutral IQ improvement when using an SCA in clinical patient CXRs.

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Can Scatter Correction Software Replace a Grid in DR Pelvic Examinations?

Cited by 12 publications

References 11 publications

Visual Evaluation of Image Quality of a Low Dose 2D/3D Slot Scanner Imaging System Compared to Two Conventional Digital Radiography X-ray Imaging Systems

Visual Evaluation of Image Quality of a Low Dose 2D/3D Slot Scanner Imaging System Compared to Two Conventional Digital Radiography X-ray Imaging Systems

Collimation and Exposure Parameter Influence Image Quality and Potential Radiation Dose to the Eye Lens of Personnel in Computed Radiography of the Canine Pelvis

Efficacy of the scatter correction algorithm in portable chest radiography

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