A dual handheld SWIR transillumination/reflectance probe for imaging lesions on tooth occlusal and proximal surfaces

Fried

2022

Diagnostics

Self Cite

The aim of this study was to compare the diagnostic performance of dual short-wavelength infrared (SWIR) transillumination and reflectance multispectral imaging devices for imaging interproximal lesions with radiography using extracted teeth that had been imaged with micro-computed tomography (microCT). Thirty-six extracted teeth with 67 lesions on the proximal surfaces were imaged using a newly fabricated SWIR multispectral proximal transillumination and reflectance imaging device along with an existing SWIR multispectral occlusal transillumination and reflectance device. The ability of SWIR imaging and radiography to detect lesions and accurately assess lesion dimensions were compared using microCT as a standard. Occlusal and proximal transillumination and occlusal reflectance performed best for imaging interproximal lesions while proximal reflectance was not useful for imaging interproximal lesions from tooth buccal and lingual surfaces. There was high correlation of the lesion dimensions measured in occlusal and proximal transillumination images compared to microCT and moderate correlation in occlusal reflectance images. The correlation between the lesion depth measured in radiographs and the lesion depth measured with microCT was not significant. This study demonstrates that SWIR occlusal and proximal transillumination and SWIR occlusal reflectance images are useful for imaging interproximal lesions and they provide more accurate measurements of lesion severity.

Section: Introductionmentioning

confidence: 99%

Measurement of the Depth of Lesions on Proximal Surfaces with SWIR Multispectral Transillumination and Reflectance Imaging

Fried

2022

Diagnostics

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“…In another clinical study at wavelengths greater than 1300 nm [12], we demonstrated that the sensitivity of SWIR imaging for interproximal and occlusal lesions was greater than radiographs. More recently we have combined SWIR reflectance and occlusal transillumination measurements taken at SWIR wavelengths into a single probe to reduce false positives since it is unlikely that confounding structural features or specular reflection (glare) are going to be present in both reflectance and transillumination images [10,[13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Evaluating interproximal and occlusal lesion severity with a dual SWIR transillumination/reflectance probe

Lasers in Dentistry XXVIII

Fried

2022

Self Cite

We have developed a clinical probe capable of acquiring simultaneous, multispectral short wavelength infrared (SWIR) reflectance and occlusal transillumination images of lesions on tooth proximal and occlusal surfaces to reduce the potential of false positives and enhance diagnosis. The dual probe was 3D printed and the imaging system uses an InGaAs camera and broadband light sources at 1310 nm for occlusal transillumination and 1600 nm for cross-polarization reflectance measurements. In this study a mathematical model to estimate the penetration depth of "hidden" occlusal lesions from the SWIR images was developed. We compared the model's estimated lesion depth on 18 extracted teeth with lesions against microCT measurements. Although the model estimated depth deviates from that measured in microCT at higher depths, there is a good linear correlation (R 2 = 0.93) between the estimated depth from SWIR images and the measured depth using microCT. SWIR occlusal transillumination images at 1300 nm also provide information about interproximal lesion penetration depth which can be directly viewed from the occlusal surface. SWIR occlusal transillumination and reflectance depth measurements on 49 natural interproximal lesions were compared with microCT measurements. There was significant correlation between the depths measured with SWIR occlusal transillumination (R 2 = 0.81) and reflectance (R 2 = 0.19) compared with the depths measured with microCT.

“…Last year we presented the results of an in vitro study using a prototype dual transillumination and reflectance probe with a germanium enhanced silicon sensor that was sensitive from 400-1600 nm [15]. We later expanded that study to evaluate 120 extracted teeth and used a high resolution InGaAs camera.…”

Section: Introductionmentioning

confidence: 99%

Compact in vivo handheld dual SWIR transillumination/reflectance imaging system for the detection of proximal and occlusal lesions

Photonic Therapeutics and Diagnostics in Dentistry, Head and Neck Surgery, and Otolaryngology

Simon

et al. 2021

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We have developed a clinical probe capable of acquiring simultaneous short wavelength infrared (SWIR) cross-polarized reflectance and occlusal transillumination images of lesions on tooth proximal and occlusal surfaces. We hypothesize that the dual SWIR reflectance and transillumination probe will improve the diagnostic accuracy of the device by reducing false positives since it is unlikely that confounding structural features or specular reflection are going to be present in both reflectance and transillumination images. In addition, the dual probe will provide complementary diagnostic information about lesion severity to help discriminate early superficial lesions on tooth surfaces from deeply penetrating lesions. The dual probe was 3D printed and equipped with a compact InGaAs camera and broadband superluminescent diode light sources that emit broadband light at 1300 nm for occlusal transillumination and 1600 nm light for cross-polarization reflectance measurements. The first clinical images acquired using this novel probe are presented.