Ch. 7 Ct Anatomy Part 2 Flashcards Preview

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Flashcards in Ch. 7 Ct Anatomy Part 2 Deck (28)
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1

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

2

Patient positioning ct chest p 7

Either supine head first or feet first -

Arms raised above head to avoid artifacts

Suspend respiration

3

Ct localizer on chest exam ? P 7

Ap

4

Where to scan ct chest? P 7

Above apices to level of adrenals inferiorly

5

Why iv contrast ct chest? P 8

Masses of chest
Hilar masses
Lymphoma
Cardiac masses
Enhance aorta and other vessels of the heart

6

Why saline flush used after iv contrast for ct of the chest? P 8

Reduce streaking artifacts in subclavian artery

7

Why cardiac gating used in ct of chest? P 9

Minimize motion of the heart

8

Mediastinum p 10

Mass of tissues and organs separating pleural space

9

Mediastinum bound to ? P 10

Anteriorly sternum

Posteriorly vertebral column

Superiorly thoracic inlet

Inferiorly diaphragm

10

Mediastinum included which ? P 10

Heart
Origins of great vessels
Trachea
Bronchi
Esophagus
Thymus
Lymph nodes
Thoracic duct
Phrenic and vagus nerves

11

Ct scan mediastinum positioning p 10

Supine- head or feet first

Arms raised above to reduce artifacts

12

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

13

Ct mediastinum area to cover? P 10

Axial slices from apices of lungs to adrenals inferiorly

14

Normal slice thickness ct mediastinum ? P 10

3mm

15

High resolution slice thickness ct mediastinum p10

0.5mm

16

Why high resolution scan mediastinum ? P 10

Emphysema
Sarcoidosis
Aids
Bronchiechtasis

17

Ct mediastinum bone ww/wl p 11

Ww- 2000

Wl- 400

18

Ct mediastinum soft tissue ww/wl p 11

Ww-300
Wl- 0

19

Ct mediastinum lung ww/wl p 11

Ww-2000

Wl- -400

20

Why ct lung survey? P 14

Locate nodules

21

Why include adrenals on lung survey? P 14

Frequent location metastic lesions

22

Ct lungs positioning p 14

Supine- head or feet first

Arms raised above head to reduce artifact

23

Why iv contrast for ct lung survey? P 14

Vascular malformation
Relationship of masses to mediastinal vessels
Evaluate and stage cancerous lung nodules

24

Ct lung survey region to scan? P 14

Sternal notch superiorly to adrenals inferiorly

25

Ct lung survey routine slice thickness p 14

3mm axial and coronal

26

Ct lung survey slice thickness if nodule suspected or found? P 14

0.5-1mm

27

Ct lung survey soft tissue ww/wl p 15

Ww-300

Wl- 0

28

Ct lung survey lung ww/wl p 15

Ww- 1500- 2000

Wl- -400 to -600