Scintillator 3
Fiber Optic Scintillator (FOS)
  • Needle Structure CsI(Tl) + XRAY Shielding Fiber Optic Plate
  • High Resolution FOS – 15lp/mm @ 20% MTF
  • Achieving Better Balance between Light output and Resolution (Compared with Gadox)
  • No Ghost Image, Lower Noise 
  • Lower Cost ( Around 200USD/pc for General Dental FOS )

Compared to conventional phosphor screen, Fiber Optic Scintillator (FOS) offer clear, sharp X-ray images with higher contrast. When used with an image readout device such as a high-resolution CCD, the X-ray image obtained can be easily digitized, saved, managed and transferred as electronic image data, thus paving the way to “fully digital X-ray imaging”.

Also, fiber optic plate used in the scintillator has excellent X-ray absorption characteristics, so that the X-rays which penetrate the X-ray scintillator then enter the CCD are reduced to less than 1%. Which could protect the CCD/CMOS sensor in the long run.

Construction Fiber Optic Plate + CsI(Tl) Scintillator +Reflective Layer + Protective Layer
Substrate Fiber Optic Plate
Maximum Dimension Diagnoal Φ80mm
Scintillator Type Needle CsI(Tl)
Scintillator Thickness 30μm – 1000μm
Scintillator Diameter 6μm – 100μm

Fiber Optic Scintillator Construction

1. Protective Firm: Protect the Scintillator from deliquescence.

2. Reflective Layer: Reflect the Light down to sensor direction for enhancing light outuput.

3. CsI(Tl) Coating: Convert Xray into Visible light.

4. Fiber optic plate: Shielding Trespass X-ray and eliminating stray light.

5. CCD/CMOS: Image capture devices.

Needle Columnar CsI(Tl)

The Needle Shape Columnar CsI(Tl) is the key component of the conversion screen. It has the function that convert Xray into Visible light. We can grow a the CsI(Tl) Column from 6um to 100um diameter.

High Resolution

Following the comparison between our Scintillator Screen and DRZ fine screen.

 

Setup for Different Applications

Application Energy of Xray (kev) CsI(Tl) Thickness (um) Resolution Required (MTF)
Crystallography 5-20 20-50

>85% @ 1lp/mm and

>10% @ 10lp/mm

Microtomography 10-50 10-40 >10% @ 30lp/mm
Mammography 20 140-200 >10% @ 10lp/mm
Dental (intraoral) 50 ~ 100 100-150 >10% @ 12lp/mm
Digital Radiography 30-50 450-600 >10% @ 4lp/mm
Nuclear Medicine (SPECT) 25-140 100-3000 >10% @ 3lp/mm

 

Hints

1. CsI Needle Structure is efficiency in reducing the diffusion of light inside the scintillator, without too much tradeoff in light output.

2.There’s a tradeoff between Light output and Resolution. When thickness increase, Light Output could be higher but result in a lower resolution. Thus, it is necessary to make a good balance between these 2 performance.

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