Imaging and range estimations of prompt X-rays using YAP(Ce) camera during particle-ion irradiation to phantoms with air cavities

Kitano, Maki; Yamamoto, Sumio; Yabe, Takuya; Akagi, Takashi; Toshito, T.; Yamaguchi, Mitsutaka; Kawachi, Naoki

doi:10.1088/1748-0221/16/08/p08064

Cited by 12 publications

(12 citation statements)

References 38 publications

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“…Imaging of prompt secondary electron bremsstrahlung x-rays (hereinafter, prompt x-rays) emitted from a subject during proton beam irradiation to the subject is also a promising method for beamrange and shape estimations [27][28][29][30][31][32][33]. It employs a pinhole x-ray camera for the imaging of prompt x-rays.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous imaging of luminescence and prompt x-rays during irradiation with spot-scanning proton beams at clinical dose level

Yamamoto¹,

Yamashita²,

Kobashi³

et al. 2023

Biomed. Phys. Eng. Express

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Prompt x-ray imaging is a promising method for observing the beam shape from outside a subject. However, its distribution is different from dose distribution, and thus a comparison with the dose is required. Meanwhile, luminescence imaging of water is a possible method for imaging the dose distribution. Consequently, we performed simultaneous imaging of luminescence and prompt x-rays during irradiation by proton beams to compare the distributions between these two different imaging methods. Optical imaging of water was conducted with spot-scanning proton beams at clinical dose level during irradiation to a fluorescein (FS) water phantom set in a black box. Prompt x-ray imaging was also conducted simultaneously from outside the black box using a developed x-ray camera during proton beam irradiation to the phantom. We measured images of the luminescence of FS water and prompt x-rays for various types of proton beams, including pencil beams, spread-out Bragg peak (SOBP) beams, and clinically used therapy beams. After the imaging, ranges were estimated from FS water and prompt x-rays and compared with those calculated with a treatment planning system (TPS). We could measure the prompt x-ray and FS water images simultaneously for all types of proton beams. The ranges estimated from the FS water and those calculated with the TPS closely matched, within a difference of several mm. Similar range difference was found between the results estimated from prompt x-ray images and those calculated with the TPS. We confirmed that the simultaneous imaging of luminescence and prompt x-rays were possible during irradiation with spot-scanning proton beams at a clinical dose level. This method can be applied to range estimation as well as comparison with the dose for prompt x-ray imaging or other imaging methods used in therapy with various types of proton beams at a clinical dose level.

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Section: Introductionmentioning

confidence: 99%

Simultaneous imaging of luminescence and prompt x-rays during irradiation with spot-scanning proton beams at clinical dose level

Yamamoto¹,

Yamashita²,

Kobashi³

et al. 2023

Biomed. Phys. Eng. Express

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“…Other methods involve imaging of the positrons produced in a subject using a positron emission tomography (PET) system, a high-energy gamma camera, or a Compton camera [13][14][15][16][17][18][19][20][21][22][23][24][25][26]. Imaging using prompt secondary electron bremsstrahlung X-rays (hereinafter, simply prompt X-rays) emitted from a subject during proton beam irradiation is also a promising method for beam-range and beam-shape estimation [27][28][29][30][31][32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous imaging of prompt gamma photons and prompt X-rays during irradiation of proton beams to human torso phantom at clinical dose level

Yamamoto

Yamashita²,

Kobashi³

et al. 2023

J. Inst.

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Although both prompt gamma photon and prompt X-ray imaging are promising methods for observing a beam shape and estimating the range of the beam from outside a subject, the images using these two methods have not been compared under realistic conditions such as in a human torso phantom. To clarify the imaging capability of prompt gamma photon and prompt X-ray imaging, simultaneous imaging with these methods was conducted during irradiation by proton beams to a human torso phantom at clinical dose level. After a human torso phantom was set on the bed of a proton therapy system, proton pencil beams of three different energies at clinical dose level and a patient planning beam for prostate cancer were used to irradiate the phantom. Prompt gamma photons and prompt X-rays emitted from the phantom were simultaneously imaged by a developed gamma camera and an X-ray camera during irradiation with proton beams to the human torso phantom. For all of the tested beams, we could obtain the beam shapes of prompt gamma photons and prompt X-rays images. The ranges could be estimated within a difference of 11 mm and 14 mm from the calculated dose for prompt gamma photon and prompt X-ray images, respectively. For both types of images, time sequential images and time count rate curves could be derived. We could clarify the imaging capabilities of prompt gamma photons and prompt X-rays were different by the simultaneous imaging during proton irradiation to a human torso phantom. Although both methods had advantages and disadvantages, we confirmed that both methods are promising for beam imaging in a torso phantom and also for future clinical use in proton therapy.

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“…Scintillators instantaneously convert ionizing radiation to low-energy photons; thus, when coupled with a photodetector, they can be used as radiation detectors in a wide range of fields including medical imaging, security, biology, and astrophysics. (1)(2)(3)(4) Typical requirements for scintillators are short luminescence lifetime, low afterglow, high light yield (LY), large effective atomic number, and high density. (5) Ideally, all these requirements are satisfied; however, such perfect scintillators do not exist at present.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cu Doping on Photoluminescence and Scintillation Properties of (C6H5C2H4NH3)2PbBr4

Onoda¹,

Akatsuka²,

Kawano³

et al. 2022

Sensors and Materials

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The photoluminescence (PL) and scintillation properties of (C 6 H 5 C 2 H 4 NH 3 ) 2 Pb 1−x Cu x Br 4 (x = 0.05, 0.1, 0.25, and 0.5) single crystals prepared by the poor-solvent diffusion method were evaluated. In the PL profiles, free-and bound-exciton luminescence peaks at 410 and 440 nm were observed, respectively. The PL quantum yields (QYs) of the x = 0.05, 0.1, 0.25, and 0.5 samples were 20.0, 19.3, 18.4, and 16.7% with 2% errors, respectively. In the scintillation profiles, a bound-exciton luminescence peak was observed at 440 nm. Under γ-ray exposure with 137 Cs, a photoabsorption peak was observed in all the samples, and the scintillation light yields of the x = 0.05, 0.1, 0.25, and 0.5 samples were estimated to be ~12000, ~11000, ~10000, and ~9700 ph/MeV with 10% errors, respectively.

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Imaging and range estimations of prompt X-rays using YAP(Ce) camera during particle-ion irradiation to phantoms with air cavities

Cited by 12 publications

References 38 publications

Simultaneous imaging of luminescence and prompt x-rays during irradiation with spot-scanning proton beams at clinical dose level

Simultaneous imaging of luminescence and prompt x-rays during irradiation with spot-scanning proton beams at clinical dose level

Simultaneous imaging of prompt gamma photons and prompt X-rays during irradiation of proton beams to human torso phantom at clinical dose level

Effect of Cu Doping on Photoluminescence and Scintillation Properties of (C6H5C2H4NH3)2PbBr4

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