Minimum number of basis projections for caries detection with local CT

Daatselaar, A.N. van; Tyndall, Donald A.; Verheij, H.G.C.; Stelt, P F van der

doi:10.1259/dmfr/14130662

Cited by 21 publications

(8 citation statements)

References 8 publications

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“…Figure 7a shows the PSNR plot against projections where no improvement in image quality is seen after a specific number of projections, p ¼ 0, for 8 Â 8 and 16 Â 16 sizes where PSNR maximizes at a certain point. This observed result is consistent with the findings of other researchers (Daatselaar et al, 2004). For 32 Â 32 case, no improvement in image quality has been seen which is attributed to small number of generations (G ¼ 750) used that have been kept unchanged for the three image sizes.…”

Section: Mutationsupporting

confidence: 92%

Determination of optimal number of projections and parametric sensitivity analysis of operators for parallel‐ray transmission tomography using hybrid continuous genetic algorithm

Qureshi

Mirza

Arif

2007

Int J Imaging Syst Tech

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In this work, a hybrid continuous genetic algorithm (HCGA) based methodology has been developed for optimization of number of projections for parallel-ray transmission tomography. The HCGA calculations with filtered back-projection (FBP) utilize 8 bits for both head and lung phantoms. The effect of selection operator through proportionate, truncation, and tournament schemes has been analyzed along with the introduction of a mixed-selection scheme. Image quality has been measured using root-mean-squared error, Euclidean error and peak signal-to-noise ratios. The sensitivity of reconstructed image quality on various mutation operators, namely standard, gradient-, and offset-based schemes, has been analyzed along with the effect of number of projections. The number of projections has resulted in maximization of image quality while minimizing the radiation hazard involved. The results of HCGA have been compared with FBP as a deterministic technique and simulated annealing (SA) as a stochastic technique for IRT approximation. For the 8 Â 8 head and lung phantoms, HCGA, SA, FBP, have resulted PSNR values correspondingly as 40.47, 33.92, 8.28 and 26.38, 20.36, 12.98 dB.

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Section: Mutationsupporting

confidence: 92%

Determination of optimal number of projections and parametric sensitivity analysis of operators for parallel‐ray transmission tomography using hybrid continuous genetic algorithm

Qureshi

Mirza

Arif

2007

Int J Imaging Syst Tech

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“…Local‐CT is a variant of CT that aims to reduce the radiation dose to the patient by using a narrow X‐ray beam that only covers the area of interest in a varying number of projections. The primary parameter of the image quality is the number of projections, the resolution amounts to 220–324 μ m which is lower than FD‐VCT (van Daatselaar et al. 2004 a, b).…”

Section: Discussionmentioning

confidence: 99%

Three‐dimensional, non‐destructive visualization of vertical root fractures using flat panel volume detector computer tomography: an ex vivoin vitro case report

et al. 2005

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The FD-VCT is an innovative diagnostic tool for non-destructive, three-dimensional evaluation of extracted teeth in pre-clinical and experimental studies. The FD-VCT allows precise visualization and evaluation of vertical root fractures or cracks in extracted teeth. Clinical application of the system may be possible if technical modifications reduce the exposure dose: the high resolution detector systems of the FD-VCT should be combined with radiation systems that focus the radiation to the area of interest.

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“…As reported by Daasstelaar et al, 12,13 dental CT is optimal for diagnosing and examining hard tissue and surrounding tissues of the cephalic and cervical regions, including jaws, teeth, and oral mucosa, in three dimensions. The device is now beginning to be applied in clinical settings.…”

Section: Introduction Cmentioning

confidence: 91%

Criteria for a Diagnosis of Caries through the DIAGNOdent

Shinohara

Takase

Amagai

et al. 2006

Photomedicine and Laser Surgery

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Objective: The aim of this study was to investigate the correlation between the demineralization depth measured by dental computed tomography (CT) and the measured value from a non-destructive dental caries diagnosis with a laser. Methods: Optimal cut-off points were obtained for enamel and dentin caries, from the measured levels from a dental caries diagnosis with a laser, to investigate the clinical usefulness of a diagnosis using a laser. Using human teeth, the demineralization depth was measured and the caries were diagnosed by a dental caries diagnosis with a laser. Results: The optimal cut-off point was investigated for accuracy, sensibility, and specificity, which were calculated from the results. These results demonstrated the correlation between the measured values and demineralization depth in both the pit and fissure caries and smooth surface caries. The optimal cut-off points were found to be 16-21 in the fissure caries and 9-11 in the smooth surface caries. 50

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Minimum number of basis projections for caries detection with local CT

Abstract: We conclude that the number of CT projections used can be reduced at least to 20 with the diagnostic performance still markedly better than that of conventional film, provided that the observer can make use of both axial and vertical stacks of CT slices.

Cited by 21 publications

References 8 publications

Determination of optimal number of projections and parametric sensitivity analysis of operators for parallel‐ray transmission tomography using hybrid continuous genetic algorithm

Determination of optimal number of projections and parametric sensitivity analysis of operators for parallel‐ray transmission tomography using hybrid continuous genetic algorithm

Three‐dimensional, non‐destructive visualization of vertical root fractures using flat panel volume detector computer tomography: an ex vivoin vitro case report

Criteria for a Diagnosis of Caries through the DIAGNOdent

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