Comparison of Different Materials for Test Phantoms in Diagnostic Radiology

Sandborg, M.; Carlsson, Gudrun Alm; Persliden, Jan; Dance, D.R.

doi:10.1093/rpd/49.1-3.345

Cited by 18 publications

(9 citation statements)

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“…Scattered radiation generated in the grid was considered. Data on grid design were obtained from Sandborg et al (1993). The program has been adapted to model digital image detectors.…”

Section: Computer Modelmentioning

confidence: 99%

Towards optimization in digital chest radiography using Monte Carlo modelling

et al. 2006

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A Monte Carlo based computer model of the x-ray imaging system was used to investigate how various image quality parameters of interest in chest PA radiography and the effective dose E vary with tube voltage (90-150 kV), additional copper filtration (0-0.5 mm), anti-scatter method (grid ratios 8-16 and air gap lengths 20-40 cm) and patient thickness (20-28 cm) in a computed radiography (CR) system. Calculated quantities were normalized to a fixed value of air kerma (5.0 microGy) at the automatic exposure control chambers. Soft-tissue nodules were positioned at different locations in the anatomy and calcifications in the apical region. The signal-to-noise ratio, SNR, of the nodules and the nodule contrast relative to the contrast of bone (C/C(B)) as well as relative to the dynamic range in the image (C(rel)) were used as image quality measures. In all anatomical regions, except in the densest regions in the thickest patients, the air gap technique provides higher SNR and contrast ratios than the grid technique and at a lower effective dose E. Choice of tube voltage depends on whether quantum noise (SNR) or the contrast ratios are most relevant for the diagnostic task. SNR increases with decreasing tube voltage while C/C(B) increases with increasing tube voltage.

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“…Scattered radiation generated in the grid was considered. Data on grid design were obtained from Sandborg et al (1993). The program has been adapted to model digital image detectors.…”

Section: Computer Modelmentioning

confidence: 99%

Towards optimization in digital chest radiography using Monte Carlo modelling

et al. 2006

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“…After a pilot study, a dry adult human skull with large physical features was chosen. This skull was coated with 2 layers of wax and placed in a plastic container full of water; the conditions were considered similar to soft tissues in studies that used phantoms (25). Thus, the physical characteristics of the phantom permitted the reproduction of a more realistic clinical situation of X-ray beam attenuation in which different mA could interfere with image quality.…”

Section: Discussionmentioning

confidence: 99%

Influence of Tube Current Settings on Diagnostic Detection of Root Fractures Using Cone-beam Computed Tomography: An In Vitro Study

Tangari-Meira

Vancetto

Dovigo

et al. 2017

Journal of Endodontics

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“…The mandibles were corresponded and stabilized to their respective maxillae with adhesive tapes based on the best dental intercuspation possible and positioning of the head of the condyle in the mandibular fossa. With a goal of simulating the attenuation determined by soft tissues during the passage of X‐rays, the skulls were initially soaked in water for 24 hours …”

Section: Methodsmentioning

confidence: 99%

Accuracy of the measurements from multiplanar and sagittal reconstructions of CBCT

Barreto

Barbosa

Ribeiro

et al. 2020

Orthod Craniofacial Res

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Objectives The purpose of this study was to assess the accuracy of linear measurements performed in multiplanar reconstructions (MPR) and sagittal reconstructions (SR) of the left hemiface obtained from cone‐beam computed tomography (CBCT) with 3D® Dolphin Imaging software by comparing them with the same measurements made on lateral cephalograms and on dry skulls. Setting and Sample Population Lateral cephalograms and CBCT (with voxels of 0.25, 0.3 and 0.4 mm) were taken of 10 dry skulls. Materials and Methods Linear distances were measured using the software's electronic rulers. Measurements performed on dry skulls using a digital caliper were considered the gold standard. The measurements were performed twice by two evaluators. Results No significant difference was found in the measurements performed with the different imaging modalities and on the dry skulls. The highest mean error was observed in the lateral cephalograms, followed by MPR and SR. Conclusions Cephalometric measurements performed on multiplanar and sagittal reconstructions from CBCT, with different spatial resolutions, are accurate when compared with the measurements obtained in lateral cephalograms.

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Comparison of Different Materials for Test Phantoms in Diagnostic Radiology

Cited by 18 publications

References 0 publications

Towards optimization in digital chest radiography using Monte Carlo modelling

Towards optimization in digital chest radiography using Monte Carlo modelling

Influence of Tube Current Settings on Diagnostic Detection of Root Fractures Using Cone-beam Computed Tomography: An In Vitro Study

Accuracy of the measurements from multiplanar and sagittal reconstructions of CBCT

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