Imaging techniques

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Mapa Mental sobre Imaging techniques, criado por EllieMolly em 02-02-2016.
EllieMolly
Mapa Mental por EllieMolly, atualizado more than 1 year ago
EllieMolly
Criado por EllieMolly quase 9 anos atrás
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Resumo de Recurso

Imaging techniques
  1. X-rays
    1. High frequency, high energy radio waves
      1. They pass through most soft tissues of the body but are absorbed by bone
        1. The x-ray source is placed as close to the patients injury as possible
          1. A piece of unexposed film is placed underneath the injury
            1. A short burst of x-rays are fired onto the injured area
              1. The film is developed. This turns the x-ray black
                1. Dark grey shows fat
                  1. Black shows gas/ air
                    1. Light grey shows muscle/ soft tissue
                      1. White shows bone
                        1. Bright white shows metal
              2. Safety precautions
                1. 1. Protective screens made of lead
                  1. 2. Lead shield used to cover and protect organs
                    1. 3. Limit on the amount of x-rays per person
                      1. 4. Only x-ray the injured area
                2. Advantages
                  1. 1. Clear pictures
                    1. 2. Relatively cheap
                      1. 3. Quick and simple
                  2. Disadvantages
                    1. 1. High dosages of radiation may lead to radiation poisoning/ cancer
                      1. 2. Can't identify soft tissue injuries
                        1. 3. There is a limit on the amount you can have
                  3. CT or CAT scans
                    1. Computed tomography or computed axial tomography
                      1. Uses x-ray protons to produce an image
                        1. Difference: detectors and florescent screen rotate around patient
                          1. The rotate around the gantry and scan the patient in a helical pattern
                            1. The image and information is interpreted by a computer software
                              1. This provides the radiographer with a detailed 3D image
                      2. Advantages
                        1. provides a large amount of detailed data
                          1. Can be used to look inside the body
                            1. Internal organs, blood vessels, bones and brain
                            2. Presents images in "slices" through the body
                            3. Disadvantages
                              1. More expensive than x-rays
                                1. Higher effective dose than x-rays
                                  1. Requires a cooperative/ sedated patient
                                2. Ultra sound scan
                                  1. Frequency of 2-20MHz
                                    1. Transmitted and received via a probe
                                      1. The probe contains a transducer
                                        1. This acts as a "loud speaker" and "microphone"
                                          1. Waves are reflected by tissues depending on their density
                                            1. Gel is used to prevent reflection at the surface
                                              1. The reflected wave signals are converted to an image
                                      2. Advantages
                                        1. 1. cheaper than other imaging techniques
                                          1. 2. Non-ionising radiation
                                            1. 3. Non invasive
                                              1. 4. Good soft tissue resolution
                                              2. Disadvantages
                                                1. 1. Nothing can be seen behind bone
                                              3. MRI
                                                1. Magnetic resonance imaging
                                                  1. A non-ionising radiation imaging technique
                                                    1. The MRI scanner applies magnetic field which causes H atoms to align with it
                                                      1. A radio frequency (RF) pulse is applied at right angles to the magnetic field
                                                        1. This causes the H atoms to gain energy and spin in the same direction
                                                          1. (Synchronously)
                                                            1. The H atoms are described as being "in phase"
                                                              1. When the RF pulse finishes two things happen:
                                                                1. First they give out energy to the surroundings
                                                                  1. Secondly they go "out of phase" and spin asynchronously
                                                                    1. Energy given out is detected and interpreted by computer software
                                                                      1. Producing in a highly detailed image
                                                        2. Advantages
                                                          1. 1. Non-ionising
                                                            1. 2. Highly detailed images
                                                              1. 3. Useful for soft tissue imaging
                                                                1. Brain, spinal cord, bones, joints, breasts, blood vessels, internal organs such as the liver, womb or prostate gland
                                                              2. Disadvantages
                                                                1. 1. Very expensive
                                                                  1. 2. Cant be used on patients with metal implants
                                                                    1. 3. Cant be performed on claustrophobic or obese patients

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