GB2477346A - Scintillator assembly for use in digital x-ray imaging - Google Patents

Scintillator assembly for use in digital x-ray imaging Download PDF

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Publication number
GB2477346A
GB2477346A GB201001618A GB201001618A GB2477346A GB 2477346 A GB2477346 A GB 2477346A GB 201001618 A GB201001618 A GB 201001618A GB 201001618 A GB201001618 A GB 201001618A GB 2477346 A GB2477346 A GB 2477346A
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GB
United Kingdom
Prior art keywords
scintillator
ray
layer
digital
ray imaging
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB201001618A
Other versions
GB201001618D0 (en
GB2477346B (en
GB2477346A8 (en
Inventor
Duncan Marshall
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Applied Scintillation Technologies Ltd
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Applied Scintillation Technologies Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Applied Scintillation Technologies Ltd filed Critical Applied Scintillation Technologies Ltd
Priority to GB1001618.6A priority Critical patent/GB2477346B/en
Publication of GB201001618D0 publication Critical patent/GB201001618D0/en
Publication of GB2477346A publication Critical patent/GB2477346A/en
Publication of GB2477346A8 publication Critical patent/GB2477346A8/en
Application granted granted Critical
Publication of GB2477346B publication Critical patent/GB2477346B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01TMEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T1/00Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
    • G01T1/16Measuring radiation intensity
    • G01T1/20Measuring radiation intensity with scintillation detectors
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01TMEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T1/00Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
    • G01T1/16Measuring radiation intensity
    • G01T1/20Measuring radiation intensity with scintillation detectors
    • G01T1/2002Optical details, e.g. reflecting or diffusing layers
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01TMEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T1/00Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
    • G01T1/16Measuring radiation intensity
    • G01T1/20Measuring radiation intensity with scintillation detectors
    • G01T1/202Measuring radiation intensity with scintillation detectors the detector being a crystal
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01TMEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T1/00Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
    • G01T1/16Measuring radiation intensity
    • G01T1/20Measuring radiation intensity with scintillation detectors
    • G01T1/202Measuring radiation intensity with scintillation detectors the detector being a crystal
    • G01T1/2023Selection of materials

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Molecular Biology (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Measurement Of Radiation (AREA)

Abstract

A scintillator assembly for use in digital x-ray imaging, comprising an underlying substrate coated with a layer of x-ray scintillator material, and a sheet of x-ray transparent material bonded over the scintillator layer and extending beyond the edge of the underlying substrate. The substrate is a fibre optic plate (FOP) and the scintillator material is CSI.

Description

Scintillator Assembly for use in Digital X-ray Imaging The present invention relates to digital x-ray imaging and, in particular, a scintillator assembly for use in digital x-ray imaging.
It is known to use a high contrast imaging transducer, constructed using a rare earth based x-ray scintillator coating applied directly onto an underlying substrate prior to bonding it to a CCD or CMOS device, to obtain digital x-ray images. For example, a Caesium Iodide (Csl) based scintillator layer can be deposited onto a fibre optic plate (FOP) using evaporation coating technologies.
The scintillator layer converts x-ray signals to optical images, which are transferred along the fibre to the CCD or CMOS device.
The use of fibre optic plates that have been directly coated with an x-ray scintiltator layer has a number of benefits over the traditional methods of bonding an x-ray screen to a substrate, such as providing higher resolution, higher contrast and light efficiency due to elimination of light losses and optical *..S distortions and allowing for variable coating thickness for custom solutions.
A problem with these fibre optic plates that has been identified, however, is that de-lamination of the scintillator assembly can occur, which is undesirable.
According to the present invention there is provided a scintillator assembly for use in digital x-ray imaging, comprising an underlying substrate coated with a layer of x-ray scintillator material, and a sheet of x-ray transparent material bonded over the scintillator layer and extending beyond the edge of the underlying substrate.
As a result of the determination that a scintillator assembly is most prone to de-lamination when a fibre optic plate is subjected to light pressure or shock applied in a direction parallel to the face, or edge, of the scintillator, the present invention provides a scintillator assembly that is considerably more robust than existing designs.
An example of the present invention will now be described with reference to the accompanying figures, in which: Figure 1 shows the forces that have been identified to cause a scintillator layer to become delaminated from an underlying substrate; Figure 2 shows how the edges of the substrate are exposed to potentially de-laminating forces; and Figures 3A and 3B show two methods of providing a scintillator assembly according to the present invention.
As illustrated in Figure 3, a sheet of x-ray transparent material, for example PC, PMMA, PS, fibreboard, PET or similar, is bonded over the entire surface of the scintillator layer and extends beyond the extent of the underlying substrate, of the component, which in this examp'e is a fibre optic plate (FOP).
The material should be stiff and tough. The sheet of x-ray transparent material acting as a shield and should, preferably, extend beyond the limits of the scintillator coating. Similarly, the thickness of the shield should be sufficient to prevent shield deformation in the event that the component is dropped.
The resulting composite structure, comprising fibre optic plate, scintillator layer and shield, is capable of extremely rough handling, sharp impacts, shocks and being dropped. Furthermore, the fibre optic plate tends to break before de-* ..S lamination occurs. De-lamination can, however, be effected by positively accessing the edge of the scintillator at the junction of the shield but this is difficult under normal handling conditions.
. .: The shield works equally well with pressure sensitive adhesive (PSA) (or other suitable adhesive) either extending over the entire surface, or being recessed such that the outer edge of scintillator is not in contact with any other * material. These two arrangements are shown in Figure 3A and 3B, respectively.
* The first method, shown in Figure 3A, has an advantage that the surface of the scintillator is optically homogeneous. The second method, shown in Figure 3B, has an advantage that the sensitive border of the scintillator does not contact any other material.
The present invention has been tested on a scintillator coated onto a fibre optic plate that has already been covered with a layer of Parylene, a layer of paint and a second layer of Parylene. The method should work equally well if applied to the first layer of Parylene, which would eliminate the need for the layer of paint or second Parylene stage of the manufacturing process. Furthermore, it is conceivable that the method would work if the shield was applied directly to the scintillator, although this would not necessarily prevent water diffusion.

Claims (3)

  1. CLAIMS1. A scintillator assembly for use in digital x-ray imaging, comprising an underlying substrate coated with a layer of x-ray scintillator material, and a sheet of x-ray transparent material bonded over the scintillator layer and extending beyond the edge of the underlying substrate.
  2. 2. The structure of claim 1, wherein the substrate is a fibre optic plate (FOP).
  3. 3. The structure of claim I or 2, wherein the scintillator layer is caesium iodide. * * * ****. * * * I S * So *ISS **S * * * * * S. *5* *
GB1001618.6A 2010-02-01 2010-02-01 Scintillator assembly for use in digital x-ray imaging Active GB2477346B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1001618.6A GB2477346B (en) 2010-02-01 2010-02-01 Scintillator assembly for use in digital x-ray imaging

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1001618.6A GB2477346B (en) 2010-02-01 2010-02-01 Scintillator assembly for use in digital x-ray imaging

Publications (4)

Publication Number Publication Date
GB201001618D0 GB201001618D0 (en) 2010-03-17
GB2477346A true GB2477346A (en) 2011-08-03
GB2477346A8 GB2477346A8 (en) 2011-08-24
GB2477346B GB2477346B (en) 2016-03-23

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB1001618.6A Active GB2477346B (en) 2010-02-01 2010-02-01 Scintillator assembly for use in digital x-ray imaging

Country Status (1)

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GB (1) GB2477346B (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1118878A1 (en) * 1998-06-18 2001-07-25 Hamamatsu Photonics K.K. Scintillator panel, radiation image sensor, and method for producing the same
US6414315B1 (en) * 1999-10-04 2002-07-02 General Electric Company Radiation imaging with continuous polymer layer for scintillator
US20070085016A1 (en) * 2005-09-27 2007-04-19 Schulz Reiner F X-ray detector
WO2007134914A1 (en) * 2006-05-24 2007-11-29 Siemens Aktiengesellschaft Scintillator plate
US20080302970A1 (en) * 2007-03-01 2008-12-11 Kabushiki Kaisha Toshiba Radiation ray detector
US20080308736A1 (en) * 2007-06-15 2008-12-18 Hamamatsu Photonics K.K. Radiation image conversion panel, scintillator panel, and radiation image sensor
US20090026383A1 (en) * 2007-07-23 2009-01-29 Samsung Electronics Co., Ltd X-Ray Detector and Method of Manufacturing the Same
US7696482B1 (en) * 2006-06-02 2010-04-13 Radiation Monitoring Devices, Inc. High spatial resolution radiation detector

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63215987A (en) * 1987-03-04 1988-09-08 Hamamatsu Photonics Kk Highly resolvable scintillation fiber plate
DE69931059T2 (en) * 1998-06-18 2006-12-07 Hamamatsu Photonics K.K., Hamamatsu SCINTILLATOR PANEL AND RADIATION IMAGE SENSOR
JP2003004854A (en) * 2001-06-25 2003-01-08 Canon Inc Radiation detector and radiation detection system
EP2530682B1 (en) * 2010-01-29 2019-11-20 Hamamatsu Photonics K.K. Radiation image conversion panel

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1118878A1 (en) * 1998-06-18 2001-07-25 Hamamatsu Photonics K.K. Scintillator panel, radiation image sensor, and method for producing the same
US6414315B1 (en) * 1999-10-04 2002-07-02 General Electric Company Radiation imaging with continuous polymer layer for scintillator
US20070085016A1 (en) * 2005-09-27 2007-04-19 Schulz Reiner F X-ray detector
WO2007134914A1 (en) * 2006-05-24 2007-11-29 Siemens Aktiengesellschaft Scintillator plate
US7696482B1 (en) * 2006-06-02 2010-04-13 Radiation Monitoring Devices, Inc. High spatial resolution radiation detector
US20080302970A1 (en) * 2007-03-01 2008-12-11 Kabushiki Kaisha Toshiba Radiation ray detector
US20080308736A1 (en) * 2007-06-15 2008-12-18 Hamamatsu Photonics K.K. Radiation image conversion panel, scintillator panel, and radiation image sensor
US20090026383A1 (en) * 2007-07-23 2009-01-29 Samsung Electronics Co., Ltd X-Ray Detector and Method of Manufacturing the Same

Also Published As

Publication number Publication date
GB201001618D0 (en) 2010-03-17
GB2477346B (en) 2016-03-23
GB2477346A8 (en) 2011-08-24

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