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LESSON 5
CHEST. IMAGING TECNHIQUES
INFLAMMATORY DISEASES OF THE LUNGS.
Plain films (PA, lateral\AP decubitus, supine,oblique\inspiratory-expiratory)
CT scanning tomography
Radionuclide scanning
Bronchography
Pulmonary angiography
MRI
The plain chest radiography consist of a PA view, with the optional addition of a
lateral view. Both should be exposed on full inspiration with the patient in the
upright position. Films taken on expiration are difficult to interpret, because in
expiration the lung bases appear hazy and the heart shadows increases in size. In
plain films investigation of diaphragm is important. For example, in exudative
pleurisy and pneumothorax diaphragm being dropped
Computed tomography . There are many indications for CT in chest disease-
Showing the presence and extent of mediastinal masses and other
mediastinal abnormalities
Showing the shape of an intrapulmonary or pleural mass
Demonstrating the presence of disease when the plain chest radiograph is
normal.
The density of the lung tissue at CT correlated in the -650-850H.
MRI can be useful in selected patients with the lung cancers, notably where the
relevant questions cannot be answered by CT. MRI has only a very small role in
the lung diseases.
Radionuclide lung scanning. There are two mayor types of radionuclide lung scan-
perfusion and ventilation lungs.
The perfusion scan uses small particles with 99mTc, injected intravenously.
These particles become trapped in the pulmonary capillaries, the distribution of
radioactivity, when imaged by a gamma camera.
For ventilation scans, the patients inhales a radioactive gas such as Xenon-
133, Xenon-127 or krypton 81m and the distribution of radioactive gas is imaged
using a gamma camera.
LESSON 5
CHEST. IMAGING TECNHIQUES
INFLAMMATORY DISEASES OF THE LUNGS.
Plain films (PA, lateral\AP decubitus, supine,oblique\inspiratory-expiratory)
CT scanning tomography
Radionuclide scanning
Bronchography
Pulmonary angiography
MRI
The plain chest radiography consist of a PA view, with the optional addition of a
lateral view. Both should be exposed on full inspiration with the patient in the
upright position. Films taken on expiration are difficult to interpret, because in
expiration the lung bases appear hazy and the heart shadows increases in size. In
plain films investigation of diaphragm is important. For example, in exudative
pleurisy and pneumothorax diaphragm being dropped
Computed tomography . There are many indications for CT in chest disease-
Showing the presence and extent of mediastinal masses and other
mediastinal abnormalities
Showing the shape of an intrapulmonary or pleural mass
Demonstrating the presence of disease when the plain chest radiograph is
normal.
The density of the lung tissue at CT correlated in the -650-850H.
MRI can be useful in selected patients with the lung cancers, notably where the
relevant questions cannot be answered by CT. MRI has only a very small role in
the lung diseases.
Radionuclide lung scanning. There are two mayor types of radionuclide lung scan-
perfusion and ventilation lungs.
The perfusion scan uses small particles with 99mTc, injected intravenously.
These particles become trapped in the pulmonary capillaries, the distribution of
radioactivity, when imaged by a gamma camera.
For ventilation scans, the patients inhales a radioactive gas such as Xenon-
133, Xenon-127 or krypton 81m and the distribution of radioactive gas is imaged
using a gamma camera.
