SEARCH
You are in browse mode. You must login to use MEMORY

   Log in to start

level: Radiography

Questions and Answers List

level questions: Radiography

QuestionAnswer
Who will draw up the local rules?The radiation protection advisor
The exposure button must how far away from the primary beam?2 metres
Who can't do X-Rays?People under 16, Owners and Pregnant Women
Where will a dosemeter be worn?On the body, under lead aprons / On the Collar or Sleeve
Which type of dosemeter contains orange coloured lithium floride crystalsThermo-Luminescent Dosemeters
What is the person who is appointed in practice for overseeing radiography in the practice called?The radiation protection supervisor
What should you not do with PPE?No folding, or crumpling of PPE
What is the minimum thickness of a lead apron?0.25mm le
What thickness should gloves, sleeves and hand shields be?0.35mm le
Define WavelengthDistance between a point on one wave and the same point on the next wave
Define FrequencyThe number of waves produced by a source each second
Define semantic affectsCell damages that pass on to succeeding cell generations
What charge does a cathode possess?Negative Charge
What charge does an anode possess?Positive Charge
What material is used in the filament?Tungsten
Why do you use Tungsten?Very high melting point
Where does the filament sit?Focussing cup
What does the glass casing surrounding the anode and cathode do?Surrounded by oil to absorb heat
What is the whole structure encased by?Lead
What is kilo voltage (kV)?Potential Difference between Cathode and Anode
What happens to the current (mA) when heating of the filament occurs in the cathode?It increases
What does emulsion do in radiographic film?Responsible for producing image
What does subbing do?Sticks emulsion to base layer
What is the supercoat used for in the radiographic film?Protective Layer
Emulsion contains what type of crystals?Silver Bromide crystals in gelatin
What happens to the silver bromide crystals when exposed to photons?Lose their bromide during processing
What type of crystals do intensifying screens contain?Phosphor Crystals
What are phosphor crystals sensitive to?Blue or Green light
What are grids?Series of thin strips of lead between material allowing the passage of X-Rays
How are parallel grids aligned?Lead strips parallel across the grid
How are focussed grids aligned?Strips are Vertical Centrally but slope on either side
How are crossed grids aligned?Strips in cross fashion
When are crossed grids used?Practices where high definition is needed
What causes shading on X-Rays?Tissues absorb different amounts of primary beam depending on structure
White shades on an X-Ray mean what?Metal
Bone is seen as what shade on X-Rays?Nearly White
Mild Grey shades on an X-Ray means?Soft Tissue and Fluid
Fat is seen as what shade on X-Rays?Dark Grey
Gas is seen as what shade on X-Rays?Very Dark
What should you do when using contrast media?Take a plain X-Ray first
Positive Contrast has a _____ atomic number solution?High
What colour will the image show when using positive contrast?White
Negative contrast has a _____ atomic number?Low
What colour will negative contrast show?Black
Where is barium sulphate used?In the gut region
Water soluble iodine carries a risk of _______ ?Anaphylactic Shock
Water soluble iodine has a osmotic pressure, so will cause ______ ?Fluids to be absorbed
Why should an animal be rolled once barium solution is ingested?Coats the gut lining
What is the interval for a series of X-Rays of the small intestine?15 minutes for 60 minutes
What should be given to examine the large intestines?Barium Enema
What does myelography show?Compressions on the spine
What contrast media is used for myleography?Low osmotic pressure water soluble iodine?
Name the two approaches used in myleographyCisternal Puncture or Lumber Puncture
How should the patient be positioned in recovery?Head propped up
During myleography how does the head need to be positioned?Chin Must touch the chest
What can happen if the contrast media reaches the cranium?Seisures
Arthrography is the imaging of what?Joint / detect soft tissue issues
What contrast is used in Arthrography?Air or Water soluble iodine
Pneumocystogram uses what contrast media?Negative media - air
Double contrast Pneumocystogram uses what media?Positive and Negative media
Fluoroscopy is _____ ?Continuous X-Ray image monitoring movement
What are the five stages of manual processing?Develop/Rinse/Fix/Wash/Dry
How long does the develop stage last?3-5 minutes
How long does the wash stage last?15-30 mins
How long does the fix stage last?10 mins
How long does the rinse stage last?10 secs
What are the four stages of automatic processing?Develop/Fix/Wash/Dry
What does the kV do?Controls the quality or penetration strength of the primary beam
The more thick a tissue is the ... the kVHigher
Why is it useful to record exposures?Identify increased risks, optimum factors for certain species and body factors
What is the film focal distance?Distance between the focal spot and the x-ray film
What will increasing the film focal distance do?Reduce the intensity of the beam to 1/4 of the film
How should urine and faeces be disposed of after scintigraphy?Radioactive waste
What is computed Tomography good for?Skeletal imaging - detects new bone formation
When should magnetic resonance imaging be used?For soft tissue injuries and pathology
What is MRI based on?Use of hydrogen in water atoms in tissues
Why do we use endoscopy?FB, Trauma and undiagnosed illnesses
How do you sterilise endoscopes?Cold sterilisation
What ultrasound frequency should be used for cats?7.5MHz - 10MHz
What ultrasound frequency is used in medium dogs?5MHz-7.5MHz
What ultrasound frequency should be used for large dogs?2MHz - 5MHz
What is an ultrasound probe called?Transducer
A transducer contains what type of crystal?Piezoelectric crystals
A mode on a ultrasound means what?Amplitude mode - sound
B Mode on an ultrasound, means what?Brightness - real time image
M mode on an ultrasound means?Movement - cardiac
A doppler shows what?Blood flow
Hyperechoic or echogenic means?Highly reflective - bone and gas - bright white echoes
Hypoechoic or echo-poor will show as?Grey appearance - soft tissues
Anechoic or echolucent is see as?Black appearance - fluid
What side should a lateral x-ray be taken on to assess heart?Right lateral
What side should thorax laterals be taken when looking at the pathology of the lungs?Left lateral
What position should never be used if pleural fluid, pneumothorax or diaphragmatic rupture is suspected?Ventrodorsal