HRCT Thorax (High resolution computed tomography).pptx

HRCT THORAX , HIGH RESOLUTION COMPUTED TOMOGRAPHY, PROTOCOLS OF HRCT

1. HRCT Thorax (High resolution computed tomography) Rukmanee Yadav Assistant Professor Department of Radiology and Imaging Technology Mewar university Rajasthan

2. HRCT Thorax (High resolution computed tomography) HRCT uses very thin slice from 0.5-1.5 mm. Many pathology of chest can be diagnosed by plain chest radiograph and routine chest CT. HRCT of chest give the image of lungs parenchyma, vessels , airspaces, and airway. CT scan diagnose the cause of unexplained cough, shortness of breath, chest pain and fever. CT scan give the wide information of pathology . Ct scan fast , painless ,non-invasive and accurate technique. HRCT scan give the thinner sections and higher resolution without loosing image quality. It is able to detect very fine details in lungs , chest CT is especially effective for diagnosis lung cancer in earlier stage.

3. Indications Diffuse interstitial lung disease(long term exposure of hazards material e.g coal dust) Emphysema (damage of alveoli cause shortness of breath) Chronic obstructive pulmonary disease(COPD) block the airflow and make the difficult breath) Hemoptysis (blood in cough) Pulmonary vascular disease Pulmonary edema(collection of fluid in lungs Branchoalveolar carcinoma Pulmonary tuberculosis Silicosis(collection of silica dust) Sarcoidosis (growth of tiny collection inflammatory cells) Hypersensitivity pneumonitis (allergy from any reason)

4. Contraindication Pregnant women Repeated exposure

5. Patient preparation Ask to the patient to bring the all report with him/her. Fasting is not require Remove the all metallic ornaments. Pacemaker is not contraindicated Identify the patient and explain the procedure to the patient. Give the clean hospital gown to the patient. U nstable patient may be sedated prior to examination.

6. E quipments CT components with system.

7. Patient position Supine position, Head first with arm elevated above the level of head. Ask the patient to hold the breath during the scan. After the position finish the laser light should be off. During HRCT full inspiration –remove the motion artifact.

8. protocol Topogram / scanogram-Anteroposterior - 1 inch below the level of chin to umbilicus. Scan extent- 1 cm above the apex of lungs to imaginary line joining the two costophrenic angles.( fromed where the chest wall and diaphragm meet) Scan direction- craniocaudal Slicethickness-0.5- 1.5 mm Slice interval-10 mm Scan time- .5- 10 sec Scan delay- no Reconstruction algorithm-sharp algorithm reconstruction-axial ,coronal ,sagittal

9. Axial, coronal and sagittal image of thorax

10. Comments Expiration scan is useful for the obstructive airway disease Inspiration scan is useful for viewing the lungs parenchyma.

11. THANK YOU