Ch. 7 Ct Anatomy Part 2 Flashcards
Indications ct chest p 7
Metastasis in pulmonary parenchyma Detection pulmonary masses Pulmonary embolism Extent mass or lesion Enlarged hilar mass or lymph nodes Pleural effusion Tumor extension into chest wall Thoracic abscess Mediastinal masses Aortic aneurysm or dissection Masses of heart or great vessels
Patient positioning ct chest p 7
Either supine head first or feet first -
Arms raised above head to avoid artifacts
Suspend respiration
Ct localizer on chest exam ? P 7
Ap
Where to scan ct chest? P 7
Above apices to level of adrenals inferiorly
Why iv contrast ct chest? P 8
Masses of chest Hilar masses Lymphoma Cardiac masses Enhance aorta and other vessels of the heart
Why saline flush used after iv contrast for ct of the chest? P 8
Reduce streaking artifacts in subclavian artery
Why cardiac gating used in ct of chest? P 9
Minimize motion of the heart
Mediastinum p 10
Mass of tissues and organs separating pleural space
Mediastinum bound to ? P 10
Anteriorly sternum
Posteriorly vertebral column
Superiorly thoracic inlet
Inferiorly diaphragm
Mediastinum included which ? P 10
Heart Origins of great vessels Trachea Bronchi Esophagus Thymus Lymph nodes Thoracic duct Phrenic and vagus nerves
Ct scan mediastinum positioning p 10
Supine- head or feet first
Arms raised above to reduce artifacts
Ct mediastinum contrast ? P 10
2-4ml/sec delay 30 secs
Saline flush used reduce streaks from subclavian artery
Esophageal contrast agent may be used coat esophagus
Ct mediastinum area to cover? P 10
Axial slices from apices of lungs to adrenals inferiorly
Normal slice thickness ct mediastinum ? P 10
3mm
High resolution slice thickness ct mediastinum p10
0.5mm
Why high resolution scan mediastinum ? P 10
Emphysema
Sarcoidosis
Aids
Bronchiechtasis
Ct mediastinum bone ww/wl p 11
Ww- 2000
Wl- 400
Ct mediastinum soft tissue ww/wl p 11
Ww-300
Wl- 0
Ct mediastinum lung ww/wl p 11
Ww-2000
Wl- -400
Why ct lung survey? P 14
Locate nodules
Why include adrenals on lung survey? P 14
Frequent location metastic lesions
Ct lungs positioning p 14
Supine- head or feet first
Arms raised above head to reduce artifact
Why iv contrast for ct lung survey? P 14
Vascular malformation
Relationship of masses to mediastinal vessels
Evaluate and stage cancerous lung nodules
Ct lung survey region to scan? P 14
Sternal notch superiorly to adrenals inferiorly
