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Pre-final topic 3: Imaging Accessories

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Pre-final topic 3: Imaging Accessories

Post by Joshua on Thu Sep 17, 2009 11:45 am

RT 200 Pre-Final

Introduction to Radiologic Technology
with Science, Technology and Society


Topic 3: Imaging accessories

Accessory – accomplice, partner, additional, extra,

Introduction:

  • The primary purpose of diagnostic radiologic apparatus is to transfer
    information from an x-ray beam to the eye/brain complex of the radiologist.

  • The x-ray beam (exit beam- scattered and x-ray forming rays) that
    emerges from the x-ray tube is distributed uniformly in space, after
    the interaction with the patient, the x-ray beam varies in intensity
    according to the characteristic of tissues which passed.

  • Exit beam (diagnostically useful information) must be transferred to a
    medium that is intelligible to the radiologist – x-ray film.

  • Other media: fluoroscopic image intensifier, TV monitor, laser imaging
    system, detectors


  1. Imaging accessories

    1. Photographic Film (X-ray film)

      1. R.L. Maddox – A film with gelatin silver bromide emulsion – basic element of x-ray film
      2. Image Receptor – The medium that converts the x-ray beam into a visible image.
      3. The most common IR is the photographic film.
      4. The construction and characteristics of radiographic film are similar to photographic film.

        1. Spectral response (spectrum matching – screen and film emulsion light absorption characteristics are matched)


      5. Film construction (150-300um)

        1. 2 basic parts:

          1. Base – foundation of RF; made of polyester (1960)
          2. Emulsion – heart of RF; x-ray photons from Intensifying screen interact with and transfer information to the emulsion; made of gelatin
            and silver halide crystals.

            1. 2 types of x-ray film base on emulsion coating:

              1. Single Emulsion
              2. Double Emulsion


            2. Overcoat – Protective coating of emulsion from scratches, pressure and contamination.


          3. Adhesive layer – between the base and emulsion; to maintain proper contact





    1. Cassettes – also a part of an image receptor; its function is a protective holder of the x-ray film and the intensifying screen.
    2. Intensifying screens – Sensitive phosphors that (purpose) converts x-rays to (visible) light (process – luminescence; type is Fluorescence – phosphor will emit light when stimulated being hit by an x-ray) to shorten exposure time and reduce patient dose. Permanently placed within the radiographic cassette.

      1. 4 Layers

        1. Protective coating – protection, screen resistant
        2. Phosphor Layer - active layer, Fluorescence occur, conversion of x-ray to light energy.
        3. Reflective Layer – between the phosphor and the base; Doubles the amount of light photons reach the film.
        4. Base - Mechanical support of the active phosphor layer; Made of Polyester.



Prepared by:

Joshua P. Sero, MAEd-HPE, RRT
RT Program Chair
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Joshua

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Re: Pre-final topic 3: Imaging Accessories

Post by mhimaii on Thu Sep 17, 2009 12:12 pm

thax sir
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mhimaii

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Re: Pre-final topic 3: Imaging Accessories

Post by renien on Thu Sep 17, 2009 6:29 pm

weehh

naa pa diay exam sa tuesday..

busa mag stUdi gid ha..

umff..

GudLuck unta magtaas atOng grado..

[b]
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renien

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Re: Pre-final topic 3: Imaging Accessories

Post by renien on Thu Sep 17, 2009 6:30 pm

SALAMAT AGAIN SIR..
Wink
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Re: Pre-final topic 3: Imaging Accessories

Post by maxriell on Fri Sep 18, 2009 7:48 pm

[img][/img]
exam na pud sa tuesday!!
good luck sa ato tanan...

thanks sir...
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Re: Pre-final topic 3: Imaging Accessories

Post by mhimaii on Mon Sep 21, 2009 4:53 pm

exam mu lang Smile
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Re: Pre-final topic 3: Imaging Accessories

Post by saxons on Tue Sep 22, 2009 4:27 pm

hala. . wala ko kasabot





-=saxons=-
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saxons

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Re: Pre-final topic 3: Imaging Accessories

Post by mhimaii on Wed Sep 23, 2009 8:26 pm

ta3

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Re: Pre-final topic 3: Imaging Accessories

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