Stationary intraoral digital tomosynthesis using a carbon nanotube X-ray source array

Shan, Jing; Tucker, Andrew; Gaalaas, Laurence; Wu, Gongting; Platín, Enrique; Mol, André; Lu, Jianping; Zhou, Otto

doi:10.1259/dmfr.20150098

Cited by 17 publications

(13 citation statements)

References 54 publications

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“…Continuous 2D images of different angles are imported to a computer for image reconstruction using digital tomosynthesis, allowing the reconstructed images of different depths to be observed. Although the prototype of this proposed system can obtain reconstructed images in different depths, the shooting time is over 10 min because current commercially available digital X-ray sensors are unable to continuously shoot at high frame rates, rendering them inapplicable to clinical dentistry [9][10][11]. Therefore, our team developed a high-frame-rate sensor in 2019 [12].…”

Section: Introductionmentioning

confidence: 99%

Geometrical Calibration of a 2.5D Periapical Radiography System

et al. 2020

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The objective of this study was to develop a geometrical calibration method applicable to the 2.5D prototype Periapical Radiography System and estimate component position errors. A two-steel-ball phantom with a precisely known position was placed in front of a digital X-ray sensor for two-stage calibration. In the first stage, the following three parameters were estimated: (1) r, the distance between the focal spot and the rotation axis of the X-ray tube; (2) ψ, the included angle between the straight line formed by the X-ray tube’s focal spot and rotation axis and the straight line of the orthogonal sensor; and (3) L4, the distance between the rotation axis and the plane where the two steel balls were positioned. In the second stage, the steel balls’ positions were determined to calculate the positions of the X-ray tube on the x, y, and z axes. Computer simulation was used to verify the accuracy of the calibration method. The results indicate that for the calibration approach proposed in this study, the differences between the estimated errors and setting errors were smaller than 0.15% in the first and second stages, which is highly accurate, verifying its applicability to accurate calibration of the 2.5D Periapical Radiography System.

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Section: Introductionmentioning

confidence: 99%

Geometrical Calibration of a 2.5D Periapical Radiography System

et al. 2020

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“…These 2D projection images were reconstructed through tomosynthesis to obtain numerous slice images of different depths. Shan et al [10] and Inscoe et al [11, 12] used a carbon nanotube X-ray source array to develop stationary digital tomosynthesis for dental imaging. In their studies [10–12], the feasibility of stationary intraoral tomosynthesis was demonstrated.…”

Section: Introductionmentioning

confidence: 99%

A Prototype Intraoral Periapical Sensor with High Frame Rates for a 2.5D Periapical Radiography System

Liao

Huang

Chen³

et al. 2019

Applied Bionics and Biomechanics

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X-ray radiography is currently used in dentistry and can be divided into two categories: two-dimensional (2D) radiographic images (e.g., using periapical film, cephalometric film, and panoramic X-ray) and three-dimensional (3D) radiographic images (e.g., using dental cone-beam computed tomography (CBCT)). Among them, 2D periapical film images are most commonly used. However, 2D periapical film compresses 3D image information into a 2D image, which means that depth cannot be identified from the image. Such compressed images lose a considerable amount of information, reducing their clinical applicability. A 2.5D periapical radiography system prototype was developed by our research team. Our previous study indicated that this prototype could be used to capture images at different depths of an object. However, the prototype was limited by its commercially available intraoral periapical sensor, which had a low temporal resolution and could not capture multiple images in a short period of time. Therefore, the total time required for image capture was too long for practical clinical application. The present study developed a high-frame-rate intraoral periapical sensor with a sensor imaging speed of up to 15 Hz. The primary components of the developed intraoral periapical sensor include a scintillator, complementary metal oxide semiconductor chip, component circuit board, and video processing board. The external dimensions of the sensor are 41×26×6.6 mm3. The performance of the developed high-frame-rate intraoral periapical sensor was verified through qualified and quantified analyses using line pairs. The results showed that the resolution of the developed intraoral periapical sensor could reach 18 lp/mm. The sensor was further installed in our 2.5D periapical radiography system to conduct image capturing. The results indicated that the developed sensor could be used for high-frame-rate imaging to incorporate tomosynthesis to obtain reconstructed slice images of different depths. The developed sensor has the potential for clinical dentistry applications in the future.

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“…Recognizing the potential implications of source array technology in dental imaging, stationary intraoral tomosynthesis (s-IOT) was proposed 29 and assessed using a benchtop CNT-source array (XinRay Systems, Morrisville, NC), dental phantoms and extracted teeth, and a standard intraoral detector (SuniRay2, Suni Medical Imaging, Inc., San Jose, CA, USA). 30 Various angular spans and dose distributions were explored to define the optimal imaging configuration. Using this benchtop device, a preliminary reader study compared the detection sensitivity of s-IOT and standard 2D intraoral radiography for interproximal caries in extracted human teeth, using micro-CT images as the ground truth.…”

Section: Introductionmentioning

confidence: 99%

“…Recognizing the potential implications of source array technology in dental imaging, stationary intraoral tomosynthesis (s‐IOT) was proposed and assessed using a benchtop CNT‐source array (XinRay Systems, Morrisville, NC), dental phantoms and extracted teeth, and a standard intraoral detector (SuniRay2, Suni Medical Imaging, Inc., San Jose, CA, USA) . Various angular spans and dose distributions were explored to define the optimal imaging configuration.…”

Section: Introductionmentioning

confidence: 99%

Characterization and preliminary imaging evaluation of a clinical prototype stationary intraoral tomosynthesis system

et al. 2018

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Purpose: Technological advancements in dental radiography have improved oral care on many fronts, yet diagnostic efficacy for some of the most common oral conditions, such as caries, dental cracks and fractures, and periodontal disease, remains relatively low. Driven by the clinical need for a better diagnostic yield for these and other dental conditions, we initiated the development of a stationary intraoral tomosynthesis (s-IOT) imaging system using carbon nanotube (CNT) x-ray source array technology. Here, we report the system characterization and preliminary imaging evaluation of a clinical prototype s-IOT system approved for human use. Methods: The clinical prototype s-IOT system is comprised of a multi-beam CNT x-ray source array, high voltage generator, control electronics, collimator cone, and dynamic digital intraoral detector. During a tomosynthesis scan, each x-ray source is operated sequentially at fixed, nominal tube current of 7mA and user-specified pulse width. Images are acquired by a digital intraoral detector and the reconstruction algorithm generates slice information in real time for operator review. In this study, the s-IOT system was characterized for tube output, dosimetry, and spatial resolution. Manufacturer specifications were validated, such as tube current, kVp, and pulse width. Tube current was measured with an oscilloscope on the analog output of the anode power supply. Pulse width, kVp, and peak skin dose were measured with a dosimeter with ion chamber and high voltage accessory. In-plane spatial resolution was evaluated via measurement of MTF and imaging of a line pair phantom. Spatial resolution in the depth direction was evaluated via artifact spread measurement. The size of the collimated radiation field was evaluated for compliance with FDA regulations. A dental phantom and human specimens of varying pathologies were imaged on a clinical 2D intraoral imaging system as well as s-IOT for comparison and to explore potential clinical applications. Results: The measured tube current, kVp, and pulse width values were within 3% of the set values. A cumulative peak skin dose of 1.12mGy was measured for one complete tomosynthesis scan using a 50ms pulse per projection view. Projection images and reconstruction slices revealed MTF values ranging from 8.1 to 9.3 cycles/mm. Line pair imaging verified this result. The radiation field was found to meet the FDA requirements for intraoral imaging devices. Tomosynthesis reconstruction slice images of the dental phantom and human specimens provided depth resolution, allowing visibility of anatomical features that cannot be seen in the 2D intraoral images. Conclusions: The clinical prototype s-IOT device was evaluated and found to meet all manufacturer specifications. Though the system capability is higher, initial investigations are targeting a low-dose range comparable to a single 2D radiograph. Preliminary studies indicated that s-IOT provides increased image quality and feature conspicuity at a dose comparable to a single 2D intraoral ...

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Stationary intraoral digital tomosynthesis using a carbon nanotube X-ray source array

Cited by 17 publications

References 54 publications

Geometrical Calibration of a 2.5D Periapical Radiography System

Geometrical Calibration of a 2.5D Periapical Radiography System

A Prototype Intraoral Periapical Sensor with High Frame Rates for a 2.5D Periapical Radiography System

Characterization and preliminary imaging evaluation of a clinical prototype stationary intraoral tomosynthesis system

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