CT WHOLE BODY ANGIOGRAPHY
Also Known As
Lab Test
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About The Test
HRCT WITHOUT CONTRAST is a specialised CT technique that captures ultra-thin images of the lung parenchyma without intravenous dye. At Cadabams Diagnostics, the scan takes 5–10 minutes, uses 40 % less radiation than conventional CT, and costs 30 % less than contrast studies.
2. What is HRCT Scan?
High-Resolution Computed Tomography (HRCT) is an advanced imaging method that:
- Uses 0.6–1 mm slice thickness
- Reconstructs images with a high-spatial-frequency algorithm
- Operates WITHOUT CONTRAST to avoid allergy risks and kidney load
- Detects early lung damage sooner than routine X-ray or standard CT
3. When and Who Needs to Take a HRCT Scan?
Consider HRCT WITHOUT CONTRAST if you:
- Have a cough lasting >3 weeks
- Were exposed to tuberculosis, mould, or industrial dust
- Live with asthma, COPD, or pulmonary fibrosis
- Need pre-surgical lung mapping or post-COVID follow-up
- Are a smoker over 40 undergoing lung-cancer screening
question.
List of Parameters
- Slice thickness & interval
- Reconstruction algorithm (bone/edge-enhancing)
- Window levels: lung (-700 HU) and mediastinal (40 HU)
- Dose-length product (DLP) for radiation tracking
- Field of view tailored to body size
Why This Test
- Detect ground-glass opacities before they worsen
- Stage idiopathic pulmonary fibrosis
- Rule out bronchiectasis in chronic infection
- Quantify COVID-19 lung involvement percentage
- Assess treatment response in sarcoidosis
When to Take Test
Benefits
Benefits of Taking the Test
- No IV line, no dye, zero contrast allergy risk
- 10-minute appointment; report ready in 30 minutes
- 40 % radiation reduction with iterative reconstruction
- Same-day referral to Cadabams pulmonology team if needed
- Cashless insurance approved
Illnesses Diagnosed with Full Body CTA
- Interstitial lung disease
- Hypersensitivity pneumonitis
- Silicosis & asbestosis
- Small-airway disease / bronchiolitis
- Lung nodules, early-stage cancer
- Post-COVID lung scarring
Preparing for test
- Wear metal-free clothing or change into our gown
- Remove necklaces, bras with underwire, and piercings
- No fasting required—eat and drink normally
- Bring prior films or CDs for comparison
- Arrive 15 minutes early for registration
11. Pre-requisites
- Doctor’s prescription (digital copy accepted)
- Valid ID for registration
- Previous CT/X-ray reports, if any
- For females: pregnancy declaration form
12. Best Time to Take the HRCT Scan
Morning slots (8 am–11 am) are ideal; shorter wait, lower patient load, and fresher technologist teams. Urgent scans are accommodated 24×7 at our main centre.
13. Eligibility
- Adults and children >5 years (pediatric dose protocol)
- BMI limit: up to 180 kg table capacity
- Not recommended in first-trimester pregnancy
- Kidney function irrelevant because scan is WITHOUT CONTRAST
14. Procedure for Taking a HRCT Scan
- Check-in at reception with prescription
- Change into gown; locker for valuables provided
- Lie on CT couch; technician positions you arms-over-head
- 3-second breath-hold instructions given via intercom
- Machine table moves twice (supine & optional prone)
- Total scanning time: 2 minutes; entire visit: 10 minutes
- Images reviewed by radiologist; report printed and emailed
15. Caution Before Taking the Test
- Declare pregnancy or suspected pregnancy
- Inform staff if you weigh >150 kg so we adjust dose
- Stay still during breath-hold to avoid motion artefacts
- Asthmatic? Bring your inhaler in case of coughing fit
Test Results
Results and Interpretations
| Finding / Observation | Description | General Interpretation / Significance |
|---|---|---|
| Normal scan | No abnormalities detected | Healthy lungs without signs of disease |
| Ground-glass opacity | Patchy hazy areas showing increased attenuation but spared vessels | Indicative of inflammation or early fibrosis; warrants clinical follow-up or monitoring |
| Reticular pattern | Network-like lines representing fibrosis | Suggests pulmonary fibrosis; often requires rheumatology or pulmonology evaluation |
| Atherosclerotic Plaque | The buildup of fats, cholesterol, and other substances on and in the artery walls. The report may describe it as "calcified" or "non-calcified." | This is the hallmark of atherosclerosis (hardening of the arteries) and is the underlying cause of most vascular diseases, including heart attacks and strokes. |
| Occlusion | A complete blockage of a blood vessel, stopping all blood flow beyond that point. | This is a very serious finding that often leads to severe symptoms (like critical limb ischemia) and typically requires urgent medical or surgical intervention. |
Risks & Limitations
Risks
- Radiation exposure: ~1.5 mSv (equal to 6 months of natural background)
- Not suitable for pregnant women unless absolutely necessary
Limitations
- Cannot evaluate pulmonary embolism without contrast
- Small nodules <3 mm may need serial scans for growth assessment
5. Types of HRCT Scan
- Prone HRCT – images taken lying on your stomach; improves visualisation of early fibrosis
- Supine HRCT – standard lying-on-back position
- Expiratory HRCT – checks for air-trapping in small airways
- Serial HRCT – low-dose yearly scans for disease monitoring
All variants can be performed WITHOUT CONTRAST at Cadabams Diagnostics on the same visit.
FAQs
Does HRCT WITHOUT CONTRAST hurt?
No. It is a painless, non-invasive scan.
How soon will I get results?
Within 30 minutes during working hours; 2 hours post 7 pm.
Can I drive after the scan?
Yes. No sedation or contrast means you can resume normal activity instantly.
Is the radiation safe?
Yes. We use low-dose protocols; one scan equals about 6 months of natural background.
When will I get my results?
At Cadabams Diagnostics, we pride ourselves on a prompt turnaround time. The radiologist's report is typically ready and sent to your referring doctor within 24 to 48 hours. Your doctor will then schedule a follow-up with you to discuss the findings in detail.