0_COMPUTER RADIOGRAPHY SEMINAR PRESENTATION - 2023 NEW (1).pptx

0_COMPUTER RADIOGRAPHY SEMINAR PRESENTATION - 2023 NEW (1).pptx0_COMPUTER RADIOGRAPHY SEMINAR PRESENTATION - 2023 NEW (1).pptx

1. Seminar Title Prepared By KALIDASPERMAL.V BSC RIT 1-st year NAHS Mentor Mr.Dinesh sekar MSC radiology Asst Professor Department of Radiology

2. INTRODUCTION OF COMPUTER RADIOGRAPHY (CR) 1. THE COMPUTER RADIOGRAPHY IS THE DIGITAL REPLACEMENT OF CONVENTIONAL x-ray FILM RADIOGRAPHY.IT IS ALSO CALLED AS FILM REPLACED TECNOLOGY. 2. Computed radiography is an indirect form of digital imaging using a cassette system similar in appearance and function to that used in conventional film-screen radiography.

3. HISTORY OF CR 1.It was developed in the mid-1980s. CR images can be recorded on laser-printed film or transmitted and stored digitally. 2.Computed radiography was introduced by Fuji (Tokyo, Japan) in 1980. 3.Over the years, diagnostic imaging evolved to meet different patients’ needs and human beings in general. In the 1980s, computed radiography (CR) joined the diagnostic imaging scene.

4. Principle of CR 1.In computed radiography, when imaging plates are exposed to X-rays , the energy of the incoming radiation is stored in a special phosphor layer. 2.A specialized machine known as a scanner . Then It is used to read out the latent image from the plate by stimulating it with a very finely focused laser beam.

5. Diagram of cr principle

6. Computed Radiology (CR) is the digital replacement of X-ray film radiography. CR radiography uses phosphor image plates to create a digital image. Although it is an older technology, it is still digital technology and is more cost effective. It does need more input and requires more time for image acquisition. Digital Radiography (DR)  is the latest advancement in Radiography. DR technology quickly transfers images to the computer so you can view and diagnose without wait time. DR systems can be fixed or mobile. These systems are perfect for any clinic or mobile practice. Digital radiography systems are more expensive than Computed Radiography, but they come with many advantages. DIFFRENCE BETWEEN CR AND DR

7. Advantages and disadvantage of CR ADVANTAGES OF CR : Lower initial cost More flexible plate sizes for positioning options Less cost to replace Great for any size clinic

8. Disadvantage of CR Need more maintenance Lower image quality Easier to damage phosphor image plates can get scratches/tears Less efficient: slower workflow More xray dose required Takes up more space More time to process images before initial viewing

9. Component of CR : 1.Image acquisition system/Imaging plates 2.Image plate reader/cassette reader 3.Image display system 4. Image storage system

10. IMAGE ACQUISITION SYSTEM Image plate made up of several layer 1.protective layer 2.phospher layer 3. Reflective layer 4.Conductive layer 5.Supportive layer

11. Protective layer This is a very thin, tough, clear plastic that protects the phosphor layer Phosphor layer : This is a layer of photostimulable phosphor that “traps” electrons during exposure. It is usually made of phosphors from the barium fluorohalide family (e.g., barium fluorohalide, chlorohalide, or bromohalide crystals). This layer may also contain a dye that differentially absorbs the stimulating light to prevent as much spread as possible and functions much the same as dye added to conventional radiographic screens.

12. Reflective layer: This is a layer that sends light in a forward direction when released in the cassette reader. This layer may be black to reduce the spread of stimulating light and the escape of emitted light. Some detail is lost in this process. Conductive layer : This is a layer of material that absorbs and reduces static electricity

13. Supportive layer This layer is generally made up of polyester and give some more strength to imaging plate THESE ALL LAYER ARE GENERALLY USED IN CASSETTE

14. Phosphor layer : Cassettes:

15. 1..THE READER IS THE MOST CRITICAL PART OF CR IMAGING SYSTEM 2. AFTER THE RADIATIO. EXPOSURE THE CR CASSETTE IS INSERTED INTO THE READER .WHEN THE IMAGING PLATE REMOVAL AND. FITTED INTO THE DRIVE MECHINISM ABOUT IMAGE PLATE REDER : 3. THE DRIVE MECHI5 MOVES THE PLATE WITH THE CONSTANT VELOCITY ALONG THE Y-AXIS THIS USALLY DONE BY SLOW MOTION

16. 4. A ROTATING AND MULTIFACED MIRROR REFLECTS THE RED LIGHT FROM A LIGGT SOURCE (HE-VE LASER ,633nm) 5 .THIS LIGHT IS DEFLECTED BACK AND FORTH ACROSSS THE PHOSPHER PLATE IN HORIZONTAL , X –DIRECTION WHICH RELEASE VISIBLE RED LIGHT (643nm) .THIS IS DONE BY FAST SCAN MODE Important 1.Both slow scan and fast scan modes are controlled by cr Computer Radiography 2.CR READER TAKES ABOUT 11. SECONDS TO PROCESS EACH CASSETTE

17. Image Display System 1. FROM THE READER,ELECTRONIC SIGNAL IS OBTAINED AND FED INTO ANOLOG AND DIGITAL converted (ADC) 2. ADC CONVERTS THE ELECTRONIC SIGNAL INTO DIGITAL SIGNAL WHICH WILL BE DISPLAY ON COMPUTER AND FURTHER PROCESSING OF IMAGES CAN BE DONE . 3.DIGITAL SIGNALS WERE RECONSTRUCTION BY COMPUTER SYSTEM WITH SPECIAL SOFTWARE INTO GRAYSCALE IMAGE THAT CAN BE SEEN ON THE MONITOR OR PRINTER 4. THE IMAGE WERE DISPLAY AT THE CONSOLE AND WE CAN PROCESS IT FURTHER TO NEXT STAGE .

18. IMAGE STORAGE SYSTEM AFTER DISPLAY OF IMAGE TGE IMAGE CAN BE PRINTED OR STORED THE IMAGE IS STORED IN COMPUTER AND FROM THIS STORAGE SYSTEM WE CAN RETRIVE THE IMAGE WHAN EVER WE WANT BY THE HELP OF STORAGE SYSTEM WE CAN USE THE BARCODE TO STORE THE PATIENT INFORMATION WHEN .THEN WE CAN STORE THE INFORMATION TEMPORARY OR PERMANENT BY USING THIS METHOD…

19. Difference size of CASSETTE : Bar code :

20. This is process to edit a image to get clear Output :