Direct-to-Digital Image Capture System. The Hologic DirectRay® ... 100. 80. 60. 40. 20. 0. Detective Quantum Efficiency (DQE). Cycles per mm. Computed. (normal ... medical to high energy applications ... Supports worldwide power standards.
Direct-to-Digital Image Capture System he Hologic DirectRay® digital image capture system uses an amorphous selenium (a-Se) coating on a non-tiled Thin-Film Transistor (TFT) matrix to capture full-size, high resolution radiographic images. DirectRay images have been proven equivalent to the highest quality screenfilm images over the full range of general radiographic examinations.
T
The DirectRay detector captures x-ray photons and converts them directly into electronic signals without the use of intensifying screens or scintillators. The result is a spectacularly detailed image, uncompromised by light scatter. Light scatter is an inherent problem in computed radiography,
screen-film and most digital image capture technologies. The DirectRay imaging system consists of the detector and a separate detector controller. Imaging system specifications • 3.6 cycles /mm Nyquist frequency DQE(0) > 45% • Wide dynamic range – captures 14 bits – 0.05 to 20 mR linear response (70 kVp, 21 mm Al)
Cutaway view showing the amorphous selenium x-ray absorber coating on the non-tiled thin-film transistor matrix and associated readout electronics.
Modulation Transfer Function (MTF) 100
DirectRay a-Se Detector 139 µm pixel
Presampled MTF (%)
80
60
Screen-Film Systems Gd2O2S 100-speed Gd2O2S 400-speed
40
Indirect Capture Systems Cesium Iodide – 200 µm pixels Cesium Iodide – 143 µm pixels Computed Radiography 14 x 17 in – 200 µm pixels
20
Normal Diagnostic Range 0 0
0.5
1
1.5
2
2.5
Spatial Frequency (cycles/mm)
3
3.5
Detective Quantum Efficiency (DQE) Cycles per mm (normal DirectRay diagnostic a-Se detector range) 139 µm pixel
Screen-film system 400 speed
Computed Radiography 14x17 in. CsI detector cassette 143 µm pixel
52%
CsI detector 200 µm pixel
0.5
46%
32%
15%
62%
1.0
45%
29%
11%
43%
56%
1.5
42%
25%
7%
33%
49%
2.0
37%
22%
5%
22%
38%
2.5
32%
18%
3%
15%
25%
3.0
26%
15%
*
10%
*
3.5
20%
13%
*
7%
*
Measurement conditions
DN 5 70 kVp, 21 mm Al
70 kVp, 1mm Al 0.5 mm Cu
141 kVp, 19 mm Al 5 uGy
DN 5 70 kVp, 2.5 uGy
75 kVp, 20 mm Al
* Outside the limits of the detector
Digital Detector and Controller Direct-to-Digital Image Capture System Detector specifications • Selenium (a-Se) semiconductor x-ray absorber coating over amorphous silicon (a-Si) Thin-Film Transistor (TFT) • Non-tiled amorphous silicon (a-Si) TFT detector matrix • X-ray energy range: medical to high energy applications • Nominal active image area of 14 x 17 inches/35 x 43 cm. Rectangular format makes it easier to output soft and hard copy images without the need for minimizing or cropping • Physical dimensions (WxHxD) of 18.4 x 18.4 x 1.7 inches/46.7 x 46.7 x 4.3 cm • Solid state. No moving parts • 19 lb/8.6 kg weight • Detector pixel – 139 µm pitch – active element size of 129 µm x 129 µm – effective fill factor 100% • Cable length to controller – maximum 95 feet/28.5 m with disconnect at 10 feet/3.0 m • Detector exterior – scratch and wear resistant – dark finish resistant to 10% bleach solution, glutaraldehyde and other antibacterial cleaners – sealed from liquids and body fluids, but not submersible
Controller specifications • Controller software – acquires and processes captured image data – calibrates detector and corrects for gain and offset variations – communicates with host system controller • Built-in diagnostic software tracks error conditions in digital detector and controller reducing downtime and time to repair • Timing specifications – Exposure window: 1 second (default) programmable – Preview time: approximately 12 seconds • Physical dimensions (WxHxD) of 19.5 x 14.9 x 3.7 inches/49.5 x 37.8 x 9.4 cm • 16.3 lb/7.3 kg weight • Supports worldwide power standards
Recommended system environment • Designed to operate under standard HVAC conditions – operating temperature range: 50 to 95° F (10 to 35 °C) with ambient airflow across the back surface • Altitude (entire system) – maximum of 10,000 feet/3,000 m for operation • From 10 to 80% non-condensing relative humidity • Static load maximum of 39 lb/18 kg applied to the front surface over a nominal 4 x 4 inch/10 x 10 cm area • Vibration maximum of 0.5 G RMS
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