529 exam 3

Question 1

5 basic densities

Answer 1

Air: absorbs least xrays, appears “blackest” on conventional radiographs
Fat: gray, somewhat darker than soft tissue
Fluid or soft tissue: blood and soft tissue (muscle) same density
Calcium: bones, most dense
Metal: appears “whitest”, buttons, barium

Question 2

Airspace disease

Answer 2

Characteristically produces opacities in the lung
Fluffy, cloudlike, hazy
Margins are indistinct
Confluent – blend into one another with imperceptible margins

Question 3

Occurs when 2 objects of the same radiographic density (water and soft tissue) touch each other
Results in loss of the edge or margin between them
Valuable in the chest but also in the analysis of imaging studies throughout the body
Right middle lobe pneumonia

Answer 3

Silhouette Sign

Question 4

Pneumonia
Pulmonary Alveolar Edema
Hemorrhage
Aspiration
Sarcoidosis
Lymphoma
Adenocarcinoma

Answer 4

Airspace diseases

Question 5

Pulmonary interstitial edema
Interstitial pneumonia
Scleroderma
Sarcoid
Bronchogenic carcinoma
Metastases
TB
Silicosis

Answer 5

Interstitial disease

Question 6

Infiltrative lung disease
Discreet particles of disease develop in the abundant interstitial network of the lung
can be focal (solitary pulmonary nodule)
Diffusely distributed in the lungs

Answer 6

Interstitial lung disease

Question 7

Complete opacification of the right or left main bronchus
Cause: bronchial obstruction
Leads to loss of volume of the affected lung
Possible causes:
Obstructing neoplasm
Asthma due to mucous plugs
Foreign body- peanuts

Answer 7

Atelectasis