PRINCIPLES OF IMAGING - Radiographic Contrast

one of the influencing factors on radiographic technology. it is also a measure of the height of the lead strip to the interspace distance and is a good measure of the selectivity of primary to scatter transmission.

• Definition and Relationship of Grid Ratio
• Relationship of the patient thickness to contrast x-ray?
• Contrast in Radiology
• Definition of OID

factors are tissue mass and density. The more the fat is thick or your patient is the more scattered radiation, therefore the contrast will decrease, meaning there is an inverse relationship between patient thickness and contrast.

• Relationship of the patient thickness to contrast x-ray?
• Contrast in Radiology
• Definition of OID
• Definition and Relationship of Grid Ratio

to define which is darker or lighter. to improve the visibility of internal organs and structures in X-ray

• Contrast in Radiology
• Definition of OID
• Definition and Relationship of Grid Ratio
• Relationship of the patient thickness to contrast x-ray?

is the distance between the object (e.g., femur, abdomen) and the image receptor, which is directly proportional to magnification. The greater the OID, the greater the magnification

• Definition of OID
• Definition and Relationship of Grid Ratio
• Relationship of the patient thickness to contrast x-ray?
• Contrast in Radiology

3 types of beam restrictors

• Aperture Diaphragms, Cones and Cylinders, Collimators
• Apneutsic Diaphragms, Cream and Codes, Comateds
• Adjusted Diaphragms, Codes and Circles, Cathode

what is the other term of source to imaging distance?

• FFD focus - film distance
• OID
• SID

this involves the time the radiographic film is submerged in the processing solution. (inversely proportional to contrast )

• development time
• distracted time
• departed time
• developed speed

useful range of optical density

• 0.25- 2.5
• 0.35- 3.5
• 0.15- 1.5
• 0.45- 4.5

Tags

NGSS.HS-PS4-5

used to cover part of patient's body. usually used in pregnant patient

• Aperture Diaphragms
• Beam Restriction
• Contrast Media
• Development Temperature

Tags

NGSS.HS-PS4-5

is used to eliminate exposure of body regions that are not required, and also reduces the exposure of the operator.

• Beam Restriction
• Contrast Media
• Development Temperature
• Image Receptor Speed

Tags

NGSS.HS-PS4-5