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HRCT Thorax Guide
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)
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.
Unstable patient may be sedated prior to examination.
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