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Fluorescent Screens |
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Fluorescent Screens |
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DRZ fluorescent screen |
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Flat panel systems have recently received much attention in the field of
radiography due to their unique performance characteristics. This technology is
classified into two distinct types; direct conversion and indirect conversion.
Direct conversion utilizes a selenium photo-conductor. Indirect conversion utilizes
a CsI:Tl or Gd2O2S:Tb scintillator
in conjunction with a silicon TFT.
Each system has certain advantages that should be considered. Indirect systems
using Gd2O2S:Tb have the advantage
of heightened stability, improved safety, lower cost and minimized environmental
impact.
Mitsubishi Chemical Corporation is pleased to introduce our optimized series of Gd2O2S:Tb
fluorescent screens for indirect digital radiography.
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| DRZ-Std
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| : Highest resolution composed of a double layer structure |
| DRZ-Plus
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| : A valance of high brightness and resolution with a double layer structure |
| DRZ-High
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| : Superior Brightness |
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| Comparative performance data of these DRZ screens is shown in figure 1. |
 Phosphor Panel for Digital Radiography
| Name |
Composition |
X-ray*1
Attenuation |
Brightness*2
[cd m-2
/Rsec-1] |
Relative
Brightness |
MTF*3 |
at
1 Lp/mm |
at
2 Lp/mm |
DRZ-STD
(Gd2O2S:Tb) |
Protective Layer |
PET 6um |
42% |
7.1 |
145% |
0.82
(106) |
0.49
(114) |
| Phosphor Layer |
140um, 68mg/cm2 |
| Supporting Layer |
Plastic Base 250um |
| Total |
406um |
DRZ-PLUS
(Gd2O2S:Tb) |
Protective Layer |
PET 6um |
53% |
8.5 |
173% |
0.72
(93) |
0.36
(83) |
| Phosphor Layer |
208um, 100mg/cm2 |
| Supporting Layer |
Plastic Base 250um |
| Total |
464um |
DRZ-HIGH
(Gd2O2S:Tb) |
Protective Layer |
PET 9um |
66% |
11.2 |
229% |
0.44
(57) |
0.16
(37) |
| Phosphor Layer |
310um, 145mg/cm2 |
| Supporting Layer |
Plastic Base 188um |
| Total |
507um |
Competitor´s
product Regular
Type
(single screen) |
Total |
380um |
40% |
4.9 |
100% |
0.77
(100) |
0.43
(100) |
Competitor´s
product Fast
Type
(single back screen) |
Total |
550um |
62% |
7.7 |
158% |
0.61
(79) |
0.26
(61) |
Conditions
| *1 |
X-ray: 80kV, Water 100mm (Tube side),
Dose measurement: Victoreen Model 500 |
| *2 |
X-ray: 80kV, no Phantom
Brightness measurement: TOPCON Luminance Colorimeter BM-5A
Dose measurement: RTI Electronics Solidose 300 |
| *3 |
X-ray: 80kV, Phontom : Water 100mm (Tube side),
Lead Test Pattern: KYOKKO Type 7 (Pb 0.10mm)
X-ray film: Fuji UM-MA HC (single emulsion type) |
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Digital radiography systems utilizing Gd2O2S:Tb
fluorescent screens have a wide variety of uses.
In addition to Flat Panel Detector systems, these screens can be used in the following
applications. |
| 1) |
High Image Quality demand applications |
: for example FPD area sensors matched with screens. |
| 2) |
Foods and baggage inspection |
: line sensors coupled with "slit" type screens. |
| 3) |
Real-time viewing applications |
: screens coupled with CCD cameras. |
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We believe our DRZ digital imaging screens can provide the solution to your unique imaging needs.
Please contact us with any special medical or industrial imaging requirements you may have.
We would be happy to discuss them with you at your convenience. |
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PI-200 fluorescent screen |
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| For portal imaging in radio-therapy, we are pleased to introduce our new PI-200
fluorescent screen. Our high thickness phosphor layer results in extre mely high
X-ray absorption and brightness for MeV radiography. |
| Phosphor Panel for Portal Radiography |
| Name |
Composition |
Relative
Brightness*1 |
MTF*2 |
| at 1 Lp/mm |
at 2 Lp/mm |
PI-200
(Gd2O2S:Tb) |
Protective Layer |
PET 6um |
122% |
0.35
(80) |
0.11
(70) |
| Phosphor Layer |
436um, 200mg/cm2 |
| Supporting Layer |
Plastic Base 188um |
| Total |
630um |
ref.
DRZ-HIGH
(Gd2O2S:Tb) |
Protective Layer |
PET 9um |
100% |
0.44
(100) |
0.16
(100) |
| Phosphor Layer |
310um, 145mg/cm2 |
| Supporting Layer |
Plastic Base 188um |
| Total |
507um |
| Conditions |
| *1 |
X-ray: 300kV, Steel 40mm (Tube side),
X-ray film: Fuji UM-MA HC (single emulsion type) |
| *2 |
X-ray: 80kV, Water 100mm (Tube side),
Lead Test Pattern: KYOKKO Type 7 (Pb 0.10mm)
X-ray film: Fuji UM-MA HC (single emulsion type) |
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