General rules Flashcards
- Which of the following rules applies generally to radiodiagnostics
- The images are oriented as if we were looking at the patient - the right side is on the left half of the image and left on the right.
- On an X-ray image of a hand how do you know which hand you are looking at? -
Only according to the R and L frames included on the slide.
- The best lighting for evaluating images is
– A dimly lit room, without a light source behind the monitor.
- Select the most correct statement
- A diagnostic monitor is more accurate in certain situations
- What name is given to an image when considering the display according to the direction of X-rays to a certain position of the body? -
Projection
- Lateral projection
– is useful especially in determining the location of a foreign body
- How do you obtain a semiaxial projection?
- it is a position in which you bend a particular part of the body (eg. head
- Which of the following things will be influenced by the patient’s position? -
chest fluid, free air in the peritoneal cavity, residual stools in colon during irriography
- Hydroaeric phenomenon
- Occurs in an AP projection of a standing patient at the air and fluid interface
- Air-fluid level occurs when
- there is non-moving fluid and gas present in the image taken with a horizontal beam
- Basic projections on XR include -
AP, PA and lateral
- When objects of the same size are different distances from the x-ray tube, the object closer to the x-tube appears
- Bigger
- The most transparent interface for XR radiation is -
Air
- The least transparent structure on XR from these is -
Metal
- Choose the correct statement:
Transparency of a tissue is affected by its thickness
- Which of the following is correct:
Fat is more transparent than muscle or water
- Contrast in X-ray imaging occurs -
when areas with different transparency are next to each other
- The silhouette sign means –
there is no border present in areas where we expect to see one
- Request form -
Should contain the basic information relevant to the examination
- What does “differential diagnosis” mean? -
a set of diagnoses that may be the cause of the pathological finding on a radiological image
- When we say “the left hemithorax is more transparent” on a chest XR, it means
– the left hemithorax is darker
- Shadow and translucency on XR can be decribed as
- Shadow is a bright spot on the image and translucency is the darker areas
- What do you call fine shadows of the displayed structure, often used in CT of the lungs?
Ground-glass opacity
- Consolidation on CT of the chest means -
complete loss of airiness in the lung and inability to differentiate the vascular structures
- When describing XR images we use the terms –
Shadows and translucencies
- In the description of an Ultrasound we use the terms
- Hypoechogenic and Hyperechogenic
- In the description of a CT, we use terms –
Hypodense and hyperdense
- In the description of an MRI we use the terms -
Hyposignal and hypersignal
