Early-stage lung cancer screening with Low Dose CT Chest (LDCT) reduces risk and increases treatment opportunities

Currently, lung cancer screening can be done using low-dose computed tomography (LDCT), which is a three-dimensional imaging method that provides higher resolution than regular X-rays.

Clinical studies have found that annual LDCT screening for early-stage lung cancer can reduce lung cancer mortality by as much as 20-30%* in high-risk individuals. Early detection of lung cancer before symptoms appear allows for prompt treatment and effective outcomes, with patients receiving a lower radiation dose compared to standard computed tomography (CT) chest scans.

Getting to Know Low Dose CT Chest (LDCT)

Low Dose CT Chest is a low-radiation computed tomography scan of the chest area that produces 3D images with good detail of the lungs. Even with a low radiation dose and without the need for contrast injection, it can effectively detect small spots or nodules in the lungs.

Comparison of Radiation Dose from Different Types of Scans

• Standard CT chest 7 mSv
• Low dose CT chest 1.5 mSv
• Chest X-ray 0.1 mSv

Why Choose Low Dose CT

• Provides three-dimensional images with better detail than 2D chest X-rays
• Uses about 5 times less radiation than standard CT Chest (Standard CT chest uses 7 mSv* while LDCT Chest uses 1.5 mSv*)
• Easy to perform, takes a short time, and has minimal side effects
• Can detect small spots or nodules in the lungs without the need for contrast injection

Preparation and Procedure

• No need to fast or avoid drinking
• Change into a gown and lie on the examination bed inside the machine
• Hold your breath during the scan for about 15-20 seconds
• The scan takes approximately 5-10 minutes

Interpretation of Results

After the scan, a radiologist will review the images for abnormalities or the likelihood of malignancy. If there is a high chance of malignancy, further tests such as PET/CT, bronchoscopy, and biopsy may be recommended for rapid diagnosis. If the likelihood is low, continuous monitoring as advised by the physician is recommended.

Important Information About Low Dose CT Chest Results

• An “abnormal” result does not confirm cancer 100%. The physician will inform the patient and provide appropriate advice.
• Current results cannot guarantee that the detected abnormality will not develop into lung cancer or that new abnormalities will not appear in the future.
• Follow-up examinations may be necessary as recommended by the physician.
• Even if the current result is “normal,” high-risk individuals are advised to continue LDCT chest screening every 1-2 years.

Dr. Sophon Duangthipnet
Pulmonologist and Critical Care Specialist
Phyathai Phaholyothin Hospital