Evaluation of double photon coincidence Compton imaging method with GEANT4 simulation

Yoshihara, Yu; Shimazoe, Kenji; Mizumachi, Yuki; Takahashi, Hiroyuki

doi:10.1016/j.nima.2017.05.039

Cited by 20 publications

(25 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previously, we proposed Compton imaging to track the direction of incident photons and extract the coincidences to localize the radiation source. 1,2) However, Compton imaging has complications both in mechanical design and in image reconstruction.…”

Section: Methodsmentioning

confidence: 99%

“…Recently, we have proposed a new concept of time-and-position correlation-type tomographic method based on a directionality-sensitive gamma camera. 1,2) In this concept, we need a nuclide that emits two photons in a relatively short period. So far, we have proposed the use of 111 In, 134 Cs, and 60 Co. [1][2][3] The decay scheme of 111 In is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…1,2) In this concept, we need a nuclide that emits two photons in a relatively short period. So far, we have proposed the use of 111 In, 134 Cs, and 60 Co. [1][2][3] The decay scheme of 111 In is shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

2光子放出核種のためのコリメータ搭載型コインシデンスイメージング

et al. 2021

Self Cite

View full text Add to dashboard Cite

We have proposed a new concept of time/position correlation type tomographic method based on a directionality-sensitive gamma camera, which can identify incident γ-ray direction. This method utilizes the correlation between two γ-ray photons and provides the radioactivity concentration in the body with a high resolution and a high signal-to-noise ratio. 111 In is known as a cascade γ-ray emitting nuclide. Besides 111 In, we have explored new candidates and found some other nuclides with different lifetimes. A focused lead collimator was designed and coupled to a pixelated detector array for this new coincidence imaging modality.The method shows a significant background rejection and an improved spatial resolution in comparison with the single-photon analysis.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

2光子放出核種のためのコリメータ搭載型コインシデンスイメージング

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…For example, 134 Cs mainly emits 796 and 605 keV gamma rays through the intermediate level with a 5.12 ps duration. We have already applied the double-photon coincidence method to Compton imaging and demonstrated its effectiveness in improving the signal-to-background ratio (SBR) by using the intersection of double Compton cones 26,27 . The Compton imaging results of 134 Cs in the 137 Cs background in Ref.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous multi-nuclide imaging via double-photon coincidence method with parallel hole collimators

Uenomachi

Shimazoe

Ogane

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

Multi-tracer imaging can provide useful information in the definitive diagnosis and research of medical, biological, and pharmaceutical sciences. Single-photon emission computed tomography (SPECT) is one of the nuclear medicine imaging modalities widely used for diagnosis or medical research and has a multi-tracer imaging capability. One of the drawbacks of multi-tracer imaging is crosstalk from other gamma rays, which affects the reconstructed image. Scattering correction methods, such as the dual- and triple-energy window methods, are used for conventional SPECT imaging to reduce the background caused by the crosstalk. This study proposes another crosstalk reduction method. Some nuclides emit two or more gamma rays through intermediate levels. Thus, detecting these gamma rays with the coincidence method allows us to distinguish a true gamma ray signal and a background signal. The nuclide position can be estimated at the intersection of two gamma rays using collimators. We demonstrate herein simultaneous 111In and 177Lu imaging via the double-photon coincidence method using GAGG detectors and parallel hole collimators. The double-photon coincidence method greatly reduces the background caused by other gamma rays and offers higher-quality images than does conventional imaging.

show abstract

“…One of the drawbacks of Compton-imaging is the low SNR caused by the drawing of multiple Compton cones, which render it difficult to apply the Compton camera to distributed source imaging. 10 Several methods can be used to solve the fundamental problem in Compton imaging. One of methods is to recoil the electron tracking in Compton camera, which uses information of recoiled electron track, and the probability from one event is limited from cones to arcs [6].…”

Section: Introductionmentioning

confidence: 99%