radiodensity etc

E. RADIODENSITY

• Combination of _____ qualities of an object that determine how much ____ it absorbs from the x ray beam

• Determined by a combination of:

  • ____ (in terms of effective atomic number and volume density)

  • ____

  • The greater an object’s ____, and/or thickness, the greater its ____

• ____

  • Refers to the amount of blackening on the radiograph

• Note:

  • Higher radiographic density = ____

  • Lower = ____

  • Bone = ____

  • Steel = ____

  • Pleural Fluid = ____

E. RADIODENSITY

• Combination of physical qualities of an object that determine how much radiation it absorbs from the x ray beam

• Determined by a combination of:

  • Composition (in terms of effective atomic number and volume density)

  • Thickness

  • The greater an object’s effective atomic number volume density, and/or thickness, the greater its radiointesity

• RADIOGRAPHIC DENSITY

  • Refers to the amount of blackening on the radiograph

• Note:

  • Higher radiographic density = bone

  • Lower = pleural fluid

  • Bone = white in x-ray

  • Steel = white

  • Pleural Fluid = dark

Combination of physical qualities of an object that determine how much radiation it absorbs from the x ray beam

RADIODENSITY •

Radiodensity is determined by a combination of?

→ Composition (in terms of effective atomic number and volume density)

→ Thickness

→ The greater an object’s effective atomic number volume density, and/or thickness, the greater its radiointesity

Refers to the amount of blackening on the radiograph

RADIOGRAPHIC DENSITY

Higher radiographic density is equal to?

bone

Lower radiographic density is equal to?

pleural fluid

Bone is equal to?

white in x-ray

Steel is equal to?

White

Pleural fluid is equal to?

dark

• Is impenetrable to x-rays

• Great radiodensity that it will attenuate almost all the x-rays from the beam

• Radiographic description is mostly WHITE (INCREASE RADIODENSE)

• E.g. bone, metallic implants

RADIOPAQUE

• Is impenetrable to x-rays

RADIOPAQUE

• Great radiodensity that it will attenuate almost all the x-rays from the beam

RADIOPAQUE

• Radiographic description is mostly WHITE (INCREASE RADIODENSE)

RADIOPAQUE

• E.g. bone, metallic implants

RADIOPAQUE

• Is easily penetrated by x-rays

• Radiolucent object attenuates very small amounts of x-rays from the beam

• Radiographics representation of the object is DARK (DECREASED RADIODENSE)

• E.g. air, soft tissues, water

RADIOLUCENT

• Is easily penetrated by x-rays

RADIOLUCENT

• Radiolucent object attenuates very small amounts of x-rays from the beam

RADIOLUCENT

• Radiographics representation of the object is DARK (DECREASED RADIODENSE)

RADIOLUCENT

• E.g. air, soft tissues, water

RADIOLUCENT

Radiodensity as a function of composition (Anatomy in Four Shades of Gray)

o Most radiolucent

o Least radiopaque

o Normally in the trachea, lungs, stomach, and digestive tract

Air (black)

Radiodensity as a function of composition (Anatomy in Four Shades of Gray)

o Most radiolucent

Air (black)

Radiodensity as a function of composition (Anatomy in Four Shades of Gray)

o Least radiopaque

Air (black)

Radiodensity as a function of composition (Anatomy in Four Shades of Gray)

o Normally in the trachea, lungs, stomach, and digestive tract

Air (black)

Radiodensity as a function of composition (Anatomy in Four Shades of Gray)

o Normally present subcutaneously, among muscle sheath, and surrounding the viscera

Fat (gray-black)

Radiodensity as a function of composition (Anatomy in Four Shades of Gray)

• most radiopaque

Lead -

Radiodensity as a function of composition (Anatomy in Four Shades of Gray)

• Soft tissues and fluids of the body including blood, muscle, cartilage, tendons, ligaments, nerves, and fluid-filled organs share approximate the same radiodensity as this

Water (gray) o

Radiodensity as a function of composition (Anatomy in Four Shades of Gray)

• Most radio-dense tissue of the body

Bone (white) o

TRUE OR FALSE: Radiolucent cannot be seen directly to the x-ray.

TRUE

TRUE OR FALSE: Radiopaque cannot be seen directly to the x-ray.

FALSE

to see the extent of the injury.

Barium Enema -

POSITIONS

• Decubitus position

• Upright

• Weight-bearing (usually requested for patients with fractures, for to see how hard is the callus)

• Describes the path of the x-ray beam as it travels from the x-ray tube, through the patient, to the image receptor

PROJECTION •

What are the most common projection terms?

• Anteroposterior (AP)

• Posteroanterior (PA)

• Lateral

What view is used for bedridden patients

RIGHT-AP View (A)

What view is this

• Used for well and upright patient

• Magnification of the heart

• Much closer would produce clearer and prominent pictures

• Bony configurations are more contoured

LEFT-PA View (B) →