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We are developing the world's first, open-type 3D PET scanner “OpenPET” for PET-image guided particle therapy such as in situ dose verification and direct tumor tracking. Following our first idea of a dual-ring Open PET (DROP), we proposed our second-generation geometry, single-ring OpenPET (SROP), which is more efficient than DROP in terms of manufacturing cost and sensitivity. In this paper, we...
The Belle II experiment at KEK, Japan, is a next generation experiment utilizing the SuperKEKB accelerator, which is currently being upgraded. SuperKEKB is expected to deliver a 50 times larger data sample than its predecessor, KEKB. In this letter, we explain the design of the Belle II software structure in detail, with the emphasis on the simulation package.
We compared the geometrical efficiencies and parallax errors of three different conceptual dedicated brain PETs, including a spherical cap design (R=18cm), a dodecahedron design (inscribed sphere radius = 15cm) and a cylindrical design (30cm in height and 30 cm in diameter) with their conventional whole body counterpart (a cylinder 20cm in height and 76 cm in diameter) by calculating the Solid Angle...
Due to an increase in the use of radiochemistry synthesis systems in Positron Emission Tomography (PET), there is a need for the development of a cost effective radiation detector which can measure localized radiation fields independent of temperature. In this experiment, a 4×4 pixilated Silicon Photomultiplier (SiPM) imaging sensor with optical fiber and scintillator has been designed and constructed...
A prototype of a high resolution small animal PET scanner with continuous LYSO crystals coupled to SiPM matrices has been developed. Images of point-like sources in different positions of the FOV have been obtained with a FWHM better than 1 mm. In the near future, a full-ring PET will be developed. Due to the increase in the number of detector heads, a new Data Acquisition (DAQ) system is needed....
Calculations of responses for experimentally studied silicon planar structures (epitaxial single-strip silicon diodes) have been carried out for various profiles of microbeams. The spatial distribution of responses on the microbeam radiation therapy (MRT) beams has been calculated taken into account both electrical field distribution inside of the detector and recombination in the diffusion region...
The use of a thermal neutron detection array comprised of boron straws, a 3He replacement technology, was embedded in a high density polyethylene (HDPE) neutron moderating array to investigate the possibility of one dimensional neutron source localization. The HDPE structure around the boron straw detectors was varied to identify the optimum background suppression and neutron source enhancement. Initial...
We have evaluated configurations of 1-meter long ZnS/6LiF scintillator screens, wavelength shifting readout, and moderator to find an optimum meeting minimum standards for neutron portal monitoring applications. MCNP5 modeling predicts that by embedding 3 polyethylene cylinders covered with ZnS/6LiF scintillator in a rectangular moderator, a sensitivity of 2.6 cps/ng 252Cf at 2 m can be achieved.
We are investigating a variety of custom system geometries for different PET applications. These geometries have detectors of varying sizes, and detection efficiency, placed at different locations in 3D space. To evaluate the performance of these unconventional geometries require the development of a general purpose reconstruction framework that is easy to adapt to any geometry. This enables investigation...
Based on the OpenPET imaging structure, one conceptual simultaneous whole-body PET/CT imaging geometry is proposed. Compared with the conventional PET/CT system, the new geometry implements simultaneous PET and CT scanning which can image the same field of view at the exactly same time. In this paper, we described the new features of the proposed geometry and conducted quantitative analysis to the...
The advanced depth-of-interaction positron emission tomography (PET) detectors have been improved to provide three-dimensionally uniform detector resolution. These detectors allow a geometry that places the detectors very close to imaging subjects, because they can maintain high spatial resolution even in the peripheral region in the field-of-view (FOV) without loss of sensitivity. In this study,...
Although X-ray mammography is the gold standard technique for breast cancer detection, it suffers from limitations due to tissue superposition which could either obscure or mimic a breast lesion. Dedicated breast computed-tomography (BrCT) represents an alternative technology with the potential to overcome these limitations. However, this technology is still under investigation in order to study and...
One of the challenging applications of PET is implementing it for in-beam PET, which is an in situ monitoring method for charged particle therapy. For this purpose, we have previously proposed two geometries for our open-type PET scanners named OpenPET. The original OpenPET had a physically opened field-of-view (FOV) between two detector rings through which irradiation beams pass. This dual-ring OpenPET...
FDK reconstruction algorithm is the most widely used for Cone Beam CT imaging system due to its simplicity and fast implementation. However, if misalignments exist in the detector, the original FDK reconstruction algorithm will result in deteriorated reconstruction quality because of the wrong correspondence of the voxels from the object and the pixels from the projection. One way is to apply rotation-based...
In this paper, we aim to find the matches of head detections from different cameras. Matching of heads detected in different cameras and assigning the same label to the detection results which are actually from the same person can help to track the person robustly in severe occlusion because matching process can give more clues when the tracked person is even totally occluded in one camera. We present...
Facial expressions play an important role in diverse disciplines ranging from entertainment (video games) to medical applications and affective computing. For tackling the problem of expression recognition, various approaches were proposed over the last two decades. These approaches are primarily divided into two types: geometry and appearance based. In this paper, we address the geometry based approaches...
In this paper we present the advances on the fabrication of THz emitters and detectors obtained within the framework of the European ROOTHz project. Two types of devices are explored, self-switching diodes and slot-diodes, using both narrow bandgap and wide bandgap semiconductors. This broad approach allows us to improve the frequency and power generated by Gunn diodes and the responsivity and noise...
We have demonstrated a QWIP photodetector embedded in metallic microcavity array with highly sub-wavelength pixel separation. This geometry allows for a drastic reduction of the effective area of the device and enhances light in-coupling with a lower number of absorbing quantum wells.
We address the problem of the 3D reconstruction of Rheims (France) using sparse data. We consider an old postcard dataset embodying the period from the beginning to the middle of the 20th century. Our reconstruction have to take into account spatial and temporal aspects that are implicitly characterizing our dataset. Indeed Rheims was destroyed during the first World War, we dispose of postcards taken...
The development of directional-position sensing neutron detector technologies has the potential to embody transformational impact on to the field of nuclear security and safeguards. Directional neutron detectors offer vastly superior background suppression enabling the detection of smaller quantities of special nuclear materials (SNM) at larger standoffs. Additionally, the ability to image the SNM...
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