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Digital Radiographic Image Processing and Manipulation

Digital Radiographic Image Processing and Manipulation. Chapter 7. What happens in the reader (CR) pre processing?. How is the image constructed digitally? LET’S FIND OUT!!!. We’ve learned how images are captured….now. THE READER IS TO BE INFORMED AS TO WHAT EXAM WILL BE PROCESSED.

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Digital Radiographic Image Processing and Manipulation

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  1. Digital Radiographic Image Processing and Manipulation Chapter 7

  2. What happens in the reader (CR) pre processing? • How is the image constructed digitally? • LET’S FIND OUT!!! We’ve learned how images are captured….now

  3. THE READER IS TO BE INFORMED AS TO WHAT EXAM WILL BE PROCESSED. • So when you “flash” the cassette, or scan with a bar code reader or in DR, choose the patient and the examination and the views that are to be done PRE-PROCESSING

  4. HISTOGRAM Graphical representation of optimal densities collected by exposure data recognition . Exposure data recognition finds the collimated edges , disregards the scatter outside of these edges Searches for anatomy This area is the source of exposure data indicator

  5. CR sampling, Carter pg 110 and Page 492 Bushong Notice the collimated area of the lungs in A and find the associated area in B on histogram and C on the response cure. Do the same for the black areas around the chest.

  6. THE SHAPE OF THE HISTOGRAM IS ANATOMY SPECIFIC

  7. histogram http://bloggingradiography.blogspot.com/2007/08/anatomy-of-histogram.html

  8. High energy=less frequency of the same density = narrower histogram Low energy=more frequencies of the same density= wider histogram

  9. The Nyquist Theorem How are signals converted from analog to digital?

  10. THIS IS STILL THE BEST EXPLANATION AND RESOURCE

  11. When sampling(converting from analog to digital) a signal, the sampling frequency must be greater than the bandwidth of the input signal • http://images.google.com/imgres?imgurl=http://www.cs.cf.ac.uk/Dave/Multimedia/nyquist.gif&imgrefurl=http://www.cs.cf.ac.uk/Dave/Multimedia/node149.html&h=420&w=529&sz=6&hl=en&start=10&um=1&tbnid=zyDOLJNUH6mM8M:&tbnh=105&tbnw=132&prev=/images%3Fq%3Dnyquist% NYQUIST THEOREM

  12. http://www.pcguide.com/art/soundSampleRate-c.html Sample? Try this

  13. WHAT DO YOU THINK THIS IS? PAGE 113 CARTER Automatic rescaling

  14. However let’s discuss image manipulation • Window • Level • Stitching SKIPPING LUT,EXPOSURE LATITUDE, MTF, QC workstation functions FOR NOW….NEXT SEMESTER

  15. PSP • CRT • ADC • IP • CR • DR • DQE • PMT • PACS REVIEW THOSE PESKY ACRONYMS!

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