1. Computed Tomography II
RAD 473
Lecture 7, 8
Prepared By:
Ala’a Ali Tayem Abed

2. Chest ct scan

3. Chest CT Can Demonstrate Various Lung Disorders, Such As:
Chest CT Is Used To:
Examine Abnormalities found on conventional chest x-rays.
Help diagnose the causes of clinical signs or symptoms of disease of the chest, such as cough, shortness of breath, chest pain, or fever.
Detect and evaluate the extent of tumors that arise in the chest, or tumors that have spread there from other parts of the body.
Assess whether tumors are responding to treatment.
Evaluate injury to the chest, including the heart, blood vessels, lungs, ribs and spine.
Chest CT Can Demonstrate Various Lung Disorders, Such As:
Lung cancer.
Pneumonia.
Tuberculosis.
Emphysema.
Bronchiectasis.
Congenital Abnormalities.
A CT angiogram (CTA) may be performed to evaluate the blood vessels (arteries and veins) in the chest. This involves the rapid injection of an iodine-containing fluid (contrast material) into a vein while obtaining CT images.

4. Image Display Settings
Lung Window:
WW 1000 to 1500 HU
WL to HU
Mediastinum Window :
WW 350 to 500HU
WL 30 to 50HU

5. Contrast Rate: 4 – 5 cc per sec.
Chest CT Without Contrast
Patient Position: Supine and arms elevated above head.
Scout (Tomogram): From lung Apices to below diaphragm.
Breath Hold: Inspiration.
Slice Thickness: mm (3-5 mm for small lesions).
Soft tissue widow and Lung widow, Bone window if needed.
Chest CT With Contrast
Contrast: Omni 300, 120 ml.
Contrast Rate: 2.5 to 3.0 cc per sec.
Contrast delay: 50sec.
CT Angiogram Chest
PE, Aortic Dissection.
Slice Thickness: 2.5 – 3 mm.
Contrast: Omni 350, ml.
Contrast Rate: 4 – 5 cc per sec.
Contrast delay: : 10 – 18 seconds, or bolus tracking.

7. CT Scan
Injector

8. CT Chest 'High Resolution'
Indications: Lung parenchyma only, lung diseases e.g. :-
Bronchiectasis.
Pulmonary Fibrosis.
Emphysema.
Slice Thickness: mm.
Lung windows only .
Contrast: None.

9. Pneumonia

10. Tuberculosis

11. Emphysema

12. Pulmonary Fibrosis

13. Pleural Effusion

14. Masses
This CT image of the chest shows a large malignant mass (purple) in one lung.
Enhanced CT scan of the chest shows large, septated anterior mediastinal mass containing fat and bony elements.

15. Lung Metastases
Axial CT scan in with malignant melanoma shows multiple round nodules and masses of varying sizes in both lungs, consistent with metastases. There are also small bilateral pleural effusions.

17. Fractures
Axial CT images show three fractures involving the sixth, seventh, and ninth ribs (arrows).

18. Fractures
Serial rib fractures which did not heal well (ribs 7-11 on the left side).

19. Aortic Aneurysm

20. The CT scan will show the Aortic dissection.

21. Pulmonary Embolism

22. Thank You
Best Wishes For All