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Chest
Image Interpretation
Simon Clarke
Senior Radiographer
PAM3006
University of Exeter
Learning Outcomes
By the end of this lecture you should be able to:
• Identify bony and soft tissue
anatomy
• Use a systematic approach to
reading a CXR
• Identify lines and tubes
• Recognise common chest
abnormalities
• Be aware of normal variants
Anatomy of the Thorax
Basic Anatomy
Trachea
Basic Anatomy
Trachea
Positioned centrally, but may angle to
the right.
The trachea gradually shifts to the
right with age.
Bifurcation
Carina
Basic Anatomy
Trachea
Positioned centrally, but may angle to
the right.
The trachea gradually shifts to the
right with age.
Don’t use the Trachea to judge how
rotated the image may be!
Bifurcation
Carina
Basic Anatomy
Aortic arch
Basic Anatomy
Aortic arch
Also referred to (inaccurately) as the
Aortic knuckle.
The arch tends to unfold, and become
more prominent, with age.
Basic Anatomy
Heart
Basic Anatomy
Heart
Size and position is vital
Basic Anatomy
Heart
Size and position is vital
Cardio-Thoracic Ratio (CTR) should be
<50% on a PA image
Basic Anatomy
Lung Fields
Right Upper Lobe
Right Middle Lobe
Right Lower
Lobe
Left Upper Lobe
Left
Lower
Lobe
Basic Anatomy
Hilar
• Made up of the major bronchi,
pulmonary arteries and veins on
the medial aspect of each lung
• Anchors the lungs to the heart,
trachea, and surrounding
structures
Basic Anatomy
Hilar
• The left hilum is commonly higher
than the right
• Changes in density, size or
positioning of the hilar is highly
indicative of abnormality
Basic Anatomy
Hilar enlargement
• Lymphadenopathy and tumours
• Pulmonary venous hypertension
(LVF, mitral stenosis or mitral reflux)
• Pulmonary arterial hypertension
(primary pulmonary hypertension
and lung diseases such as COPD)
• Increased pulmonary blood flow
Basic Anatomy
Pleural surfaces
• Visceral Pleura (outer)
• Parietal Pleura (inner)
• Lung markings should reach the
thoracic wall
Basic Anatomy
Pleural surfaces
Only visible when there is an
abnormality present
• Pleural thickening
• Fluid in the pleural spaces
• Air in the pleural spaces
Basic Anatomy
Diaphragm
• The hemidiaphragms are not at
the same level.
• The left hemidiaphragm is
commonly higher than the right by
one intercostal rib space height
(~2 cm)
Basic Anatomy
Diaphragm
• When one hemidiaphragm is
significantly higher than the other
(>3cm) an abnormality is likely
The importance of image quality
The importance of image quality
Rotation
Side lifted from detector appears lighter. Hila can look distorted
The importance of image quality
Rotation
Side lifted from detector appears lighter. Hila can look distorted
Inspiration
Less than 6 anterior/8 posterior ribs causes crowding of diaphragm and hila
The importance of image quality
Rotation
Side lifted from detector appears lighter. Hila can look distorted
Inspiration
Less than 6 anterior/8 posterior ribs causes crowding of diaphragm and hila
Penetration
Under-exposed = can cause false positives for pulmonary fibrosis or oedema
The importance of image quality
Rotation
Side lifted from detector appears lighter. Hila can look distorted
Inspiration
Less than 6 anterior/8 posterior ribs causes crowding of diaphragm and hila
Penetration
Under-exposed = can cause false positives for pulmonary fibrosis or oedema
Angulation
Clavicles projected over apexes
Systematic review of the CXR
1. Trachea
2. Lung Fields
3. Silhouette Sign
4. Mediastinum & Heart
5. Fissures
6. Hila
7. Diaphragm and below diaphragm
8. Bones
9. Soft tissue
10. Abnormal densities
Don’t forget satisfaction of search!
Silhouette Sign
Silhouette Sign
On a normal CXR, the outline (silhouette) of the heart
borders; aortic arch; ascending and descending aorta and
hemidiaphragms should be clearly visible where they are in
contact with a specific portion of the lung due to the
natural subject contrast.
Silhouette Sign
The silhouette sign is a loss of this clearly defined border.
Identify exactly which silhouette is obliterated - this will
indicate where the lung pathology is located.
Pushed or Pulled?
When lung anatomy has shifted, it’s important to decide if
it has been pulled to one side, or pushed away from the
other.
Pushed or Pulled?
Pushed
• Massive pleural effusion
• Structures displaced to
other side
• Diaphragm depressed
• Ribs widened
Pulled
• Lobular collapse
• Structures displaced to
the same side
• Diaphragm pulled up
• Ribs crowded
Lines and Tubes
Nasogastric Tube
NG tube is used for short or medium
term nutritional support, and also for
aspiration of stomach contents
Nasogastric Tube
Check correct position:
• tube bisects the carina
• tube crosses the diaphragm in the
midline
• the tip sits below the diaphragm
Nasogastric Tube
It shouldn’t divert down the bronchi
and into the lung!
Nasogastric Tube
It shouldn’t divert down the bronchi
and into the lung!
Or be curled in the oesophagus!
Endotracheal Tube
Inserted into the trachea to establish
and maintain a patent airway
The tip of the ET tube should be
approximately 5 cm above the carina
Carina
Tip of ET
tube
PICC Line
Peripherally Inserted Central Catheter
Intravenous access for a prolonged
period (e.g., chemotherapy, extended
antibiotic therapy, or total parenteral
nutrition)
PICC Line
• Inserted under Interventional
Radiology or Theatre C-arm
• Inserted into peripheral vein in the
arm (cephalic, basilic or brachial)
• Tip rests in the distal superior vena
cava or cavoatrial junction.
CVC Line
Central Venous Catheter
• inserted into the superior vena
cava or right atrium
• Inserted without X-ray guidance,
so check CXR required
White arrow:
PICC Line
Black arrow:
CVC Line
Common abnormalities
Pneumothorax
Air trapped in the pleural space
Causes include:
• Penetrating injury to the lung
• Rib fractures
• Air blisters breaking open under
pressure changes (diving or high
altitude flight)
• Medical interventions (biopsies,
pacemaker insertions, etc.)
Pneumothorax
In some cases, intra-pleural air volume
will increase, exerting pressure on the
mediastinal and intra-thoracic
structures.
This is known as a
Tension Pneumothorax
Positivepressure
Pneumothorax
In some cases, intra-pleural air volume
will increase, exerting pressure on the
mediastinal and intra-thoracic
structures.
This is known as a
Tension Pneumothorax
This is a medical
emergency!
Positivepressure
Tension
Pneumothorax
Additional possible signs:
• Ipsilateral increased intercostal
spaces
• Shift of the mediastinum to the
contralateral side
• Depression of the hemidiaphragm
(Ipsilateral = same side / Contralateral = opposite side)
Increased space
Flattened
Shift
Consolidation
• Alveoli and small airways fill with
fluid, giving dense white
appearance
• Consolidation does not necessarily
imply an infection
Area of
consolidation
(Upper Right
Lobe)
Horizontal
fissure
Consolidation
Larger, fluid-free airways may appear
darker against the white-out lung
area.
This is called an air bronchogram
Pleural effusion
• Pleural effusion is excess fluid that
accumulates in the pleural cavity
• Impairs breathing by restricting
the expansion of the lungs
Curved meniscus with blunting
of costaphrenic and
cardiophrenic angles
Pleural effusion
• Need at least 175ml of pleural fluid
before it becomes visible on a PA
image
• On a lateral image effusion of >75ml
can be visible
• At least 500ml must be present to be
seen on a supine CXR
Pericardial effusion
Pulmonary Oedema
• Fluid accumulation in the air
spaces and parenchyma
(functional parts) of the lungs
• Impairs gas exchange can lead to
fatal respiratory distress or cardiac
arrest
• Due to either left ventricular
failure (LVF) or injury to the lung
Lung Mass
• Lung cancer is the most common
fatal malignancy worldwide in
both men and women
• Lesions are smaller than 3cm
• Masses are larger than 3cm
Solitary Pulmonary
Nodule
Widespread
pulmonary
metastases
Lung Mass
• Cavitation or calcification - highly
associated with malignancy
• Lobulated or scalloped margins -
intermediate probability
• Smooth margins - more likely
benign (unless metastatic in origin)
Malignant
cancerous
mass
Tuberculosis Pneumonia (RML)
Surgical Emphysema Perforated Bowel
Rib fracture Rib lesion (osteomyelitis)
Normal variants
Dextrocardia situs inversus totalisDextrocardia
Complete transposition (right to left reversal) of all of the abdominal
organs
Heart points toward the right side of the
chest
Any questions?
Thank you for your attention
Simon Clarke
Senior Radiographer
PAM3006
University of Exeter

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Chest Interpretation Year 3 REVISED

  • 1. Chest Image Interpretation Simon Clarke Senior Radiographer PAM3006 University of Exeter
  • 2. Learning Outcomes By the end of this lecture you should be able to: • Identify bony and soft tissue anatomy • Use a systematic approach to reading a CXR • Identify lines and tubes • Recognise common chest abnormalities • Be aware of normal variants
  • 3. Anatomy of the Thorax
  • 5. Basic Anatomy Trachea Positioned centrally, but may angle to the right. The trachea gradually shifts to the right with age. Bifurcation Carina
  • 6. Basic Anatomy Trachea Positioned centrally, but may angle to the right. The trachea gradually shifts to the right with age. Don’t use the Trachea to judge how rotated the image may be! Bifurcation Carina
  • 8. Basic Anatomy Aortic arch Also referred to (inaccurately) as the Aortic knuckle. The arch tends to unfold, and become more prominent, with age.
  • 10. Basic Anatomy Heart Size and position is vital
  • 11. Basic Anatomy Heart Size and position is vital Cardio-Thoracic Ratio (CTR) should be <50% on a PA image
  • 12. Basic Anatomy Lung Fields Right Upper Lobe Right Middle Lobe Right Lower Lobe Left Upper Lobe Left Lower Lobe
  • 13. Basic Anatomy Hilar • Made up of the major bronchi, pulmonary arteries and veins on the medial aspect of each lung • Anchors the lungs to the heart, trachea, and surrounding structures
  • 14. Basic Anatomy Hilar • The left hilum is commonly higher than the right • Changes in density, size or positioning of the hilar is highly indicative of abnormality
  • 15. Basic Anatomy Hilar enlargement • Lymphadenopathy and tumours • Pulmonary venous hypertension (LVF, mitral stenosis or mitral reflux) • Pulmonary arterial hypertension (primary pulmonary hypertension and lung diseases such as COPD) • Increased pulmonary blood flow
  • 16. Basic Anatomy Pleural surfaces • Visceral Pleura (outer) • Parietal Pleura (inner) • Lung markings should reach the thoracic wall
  • 17. Basic Anatomy Pleural surfaces Only visible when there is an abnormality present • Pleural thickening • Fluid in the pleural spaces • Air in the pleural spaces
  • 18. Basic Anatomy Diaphragm • The hemidiaphragms are not at the same level. • The left hemidiaphragm is commonly higher than the right by one intercostal rib space height (~2 cm)
  • 19. Basic Anatomy Diaphragm • When one hemidiaphragm is significantly higher than the other (>3cm) an abnormality is likely
  • 20. The importance of image quality
  • 21. The importance of image quality Rotation Side lifted from detector appears lighter. Hila can look distorted
  • 22. The importance of image quality Rotation Side lifted from detector appears lighter. Hila can look distorted Inspiration Less than 6 anterior/8 posterior ribs causes crowding of diaphragm and hila
  • 23. The importance of image quality Rotation Side lifted from detector appears lighter. Hila can look distorted Inspiration Less than 6 anterior/8 posterior ribs causes crowding of diaphragm and hila Penetration Under-exposed = can cause false positives for pulmonary fibrosis or oedema
  • 24. The importance of image quality Rotation Side lifted from detector appears lighter. Hila can look distorted Inspiration Less than 6 anterior/8 posterior ribs causes crowding of diaphragm and hila Penetration Under-exposed = can cause false positives for pulmonary fibrosis or oedema Angulation Clavicles projected over apexes
  • 25. Systematic review of the CXR 1. Trachea 2. Lung Fields 3. Silhouette Sign 4. Mediastinum & Heart 5. Fissures 6. Hila 7. Diaphragm and below diaphragm 8. Bones 9. Soft tissue 10. Abnormal densities Don’t forget satisfaction of search!
  • 27. Silhouette Sign On a normal CXR, the outline (silhouette) of the heart borders; aortic arch; ascending and descending aorta and hemidiaphragms should be clearly visible where they are in contact with a specific portion of the lung due to the natural subject contrast.
  • 28. Silhouette Sign The silhouette sign is a loss of this clearly defined border. Identify exactly which silhouette is obliterated - this will indicate where the lung pathology is located.
  • 29. Pushed or Pulled? When lung anatomy has shifted, it’s important to decide if it has been pulled to one side, or pushed away from the other.
  • 30. Pushed or Pulled? Pushed • Massive pleural effusion • Structures displaced to other side • Diaphragm depressed • Ribs widened Pulled • Lobular collapse • Structures displaced to the same side • Diaphragm pulled up • Ribs crowded
  • 32. Nasogastric Tube NG tube is used for short or medium term nutritional support, and also for aspiration of stomach contents
  • 33. Nasogastric Tube Check correct position: • tube bisects the carina • tube crosses the diaphragm in the midline • the tip sits below the diaphragm
  • 34. Nasogastric Tube It shouldn’t divert down the bronchi and into the lung!
  • 35. Nasogastric Tube It shouldn’t divert down the bronchi and into the lung! Or be curled in the oesophagus!
  • 36. Endotracheal Tube Inserted into the trachea to establish and maintain a patent airway The tip of the ET tube should be approximately 5 cm above the carina Carina Tip of ET tube
  • 37. PICC Line Peripherally Inserted Central Catheter Intravenous access for a prolonged period (e.g., chemotherapy, extended antibiotic therapy, or total parenteral nutrition)
  • 38. PICC Line • Inserted under Interventional Radiology or Theatre C-arm • Inserted into peripheral vein in the arm (cephalic, basilic or brachial) • Tip rests in the distal superior vena cava or cavoatrial junction.
  • 39. CVC Line Central Venous Catheter • inserted into the superior vena cava or right atrium • Inserted without X-ray guidance, so check CXR required White arrow: PICC Line Black arrow: CVC Line
  • 41. Pneumothorax Air trapped in the pleural space Causes include: • Penetrating injury to the lung • Rib fractures • Air blisters breaking open under pressure changes (diving or high altitude flight) • Medical interventions (biopsies, pacemaker insertions, etc.)
  • 42. Pneumothorax In some cases, intra-pleural air volume will increase, exerting pressure on the mediastinal and intra-thoracic structures. This is known as a Tension Pneumothorax Positivepressure
  • 43. Pneumothorax In some cases, intra-pleural air volume will increase, exerting pressure on the mediastinal and intra-thoracic structures. This is known as a Tension Pneumothorax This is a medical emergency! Positivepressure
  • 44. Tension Pneumothorax Additional possible signs: • Ipsilateral increased intercostal spaces • Shift of the mediastinum to the contralateral side • Depression of the hemidiaphragm (Ipsilateral = same side / Contralateral = opposite side) Increased space Flattened Shift
  • 45. Consolidation • Alveoli and small airways fill with fluid, giving dense white appearance • Consolidation does not necessarily imply an infection Area of consolidation (Upper Right Lobe) Horizontal fissure
  • 46. Consolidation Larger, fluid-free airways may appear darker against the white-out lung area. This is called an air bronchogram
  • 47. Pleural effusion • Pleural effusion is excess fluid that accumulates in the pleural cavity • Impairs breathing by restricting the expansion of the lungs Curved meniscus with blunting of costaphrenic and cardiophrenic angles
  • 48. Pleural effusion • Need at least 175ml of pleural fluid before it becomes visible on a PA image • On a lateral image effusion of >75ml can be visible • At least 500ml must be present to be seen on a supine CXR
  • 50. Pulmonary Oedema • Fluid accumulation in the air spaces and parenchyma (functional parts) of the lungs • Impairs gas exchange can lead to fatal respiratory distress or cardiac arrest • Due to either left ventricular failure (LVF) or injury to the lung
  • 51. Lung Mass • Lung cancer is the most common fatal malignancy worldwide in both men and women • Lesions are smaller than 3cm • Masses are larger than 3cm Solitary Pulmonary Nodule Widespread pulmonary metastases
  • 52. Lung Mass • Cavitation or calcification - highly associated with malignancy • Lobulated or scalloped margins - intermediate probability • Smooth margins - more likely benign (unless metastatic in origin) Malignant cancerous mass
  • 55. Rib fracture Rib lesion (osteomyelitis)
  • 57. Dextrocardia situs inversus totalisDextrocardia Complete transposition (right to left reversal) of all of the abdominal organs Heart points toward the right side of the chest
  • 59. Thank you for your attention Simon Clarke Senior Radiographer PAM3006 University of Exeter