1. Digital Imaging

2. acronyms PSP CRT ADC IP CR DR PACS SNR CNR 10. CCD 11. FOV 12. LUT
13. DICOM
14. RIS
15. HIS
16. TFT
17. DQE

3. Photostimulable phosphor-europian activated barium fluorohalide (=200 speed)
Cathode-ray tube or computer monitor
Analog to digital converter
Imaging plate
computed
/digital radiography
Picture archiving communication systems

4. SIGNAL TO NOISE RATIO PG 410 –BUSHONG The higher the signal the less the noise.
CONTRAST TO NOISE RATIO can be manipulated until noise becomes too apparent-limited by the SNR
Charge coupled device- crystal silicon- small, replaces vidicon in fluoro, device used in DR
Field of View –how much of the patient is imaged in the matrix
Look up Table – plotting grays on a scale
Digital imaging and communications in medicine -blending PACS and other imaging modalities
Radiology Information system
Hospital Information system

5. Thin Film Transmitters- indirect conversion detector in DR
Thin Film Transmitters- indirect conversion detector in DR. Stores electronic charge (from converted light) before computer processes it.
Detective Quantum Efficiency converting x-ray intensities into a radiographic image
DAP-Dose Area Product-multiplication of the dose and the area exposed
NYQUIST-Sampling frequency of digital data

6. Computers connected together in a hospital by LAN
Outside computers connected to hospital server by VPN

7. INDIRECT LAYERING FLUORESCENT (ONLY IN INDIRECT-WHY?)
PHOTODETECTOR LAYER
TFT

8. AMORPHOUS SILICON-RELEASES ELECTRONS WHEN STRUCK BY LITE (INDIRECT)
AMORPHOUS SELENIUM-RELEASES ELECTRONS WHEN STRUCK BY X-RAY PHOTONS (DIRECT)

9. FOV/MATRIX/PIXEL
FOV can increase without change to Matrix or Matrix can change w/o change to FOV –
What about the pixel?

10. Question?
Does the pixel size change if the FOV changes and the matrix stays the same? Or what if the matrix changes but the FOV stays the same?

11. If the FOV increases and the matrix stays the same, the pixel size increases