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Chest CT for physiotherapists: what HRCT, CT pulmonary angiography and contrast CT each answer, the patterns that change airway clearance and exercise, and how to use the report. The client guide to having a CT follows below.
Findings that change physiotherapy
| Finding on the report | Usually means | What it changes |
|---|---|---|
| Bronchiectasis (airway wider than its artery, loss of tapering) | Permanently widened airways | Daily airway clearance; the lobes involved guide positioning |
| Mucus plugging, tree-in-bud | Retained secretions or small-airway infection, including NTM | Airway clearance and a sputum sample |
| Ground-glass opacity | Inflammation, infection, oedema or early fibrosis | Clearance only for secretions; test oxygen saturation on exertion |
| Reticulation, traction bronchiectasis, honeycombing | Established fibrosis | Pulmonary rehabilitation and an exertional oxygen assessment |
| Emphysema and its distribution; fissure completeness | Heterogeneous upper-lobe disease may suit LVRS or valves | Consider referral for volume-reduction assessment; pulmonary rehabilitation first |
| Filling defects on CTPA | Pulmonary embolism | Follow the local protocol on anticoagulation before exercise, then mobilise early |
| Effusion, pleural thickening or a mass | Pleural disease or malignancy | Clearance will not help an effusion; liaise with the treating team |
What this changes in practice
- Read the report's findings and distribution, not just the conclusion: which lobes are affected guides positioning and clearance.
- Fibrosis and ground-glass change predict exertional desaturation; measure it rather than assume it.
- Emphysema distribution and fissure integrity decide eligibility for LVRS or valves.
A CT (computed tomography) scan takes many X-ray pictures from different angles and builds them into detailed cross-sections — like looking at the chest slice by slice. It shows far more than a plain X-ray, so it's used when a clearer answer is needed: to look closely at the lungs, airways and blood vessels. It uses more radiation than an X-ray, so it's chosen when that extra detail will change your care.
Why it's done & the main types
| Type of CT | What it's for |
|---|---|
| Standard chest CT | A detailed look at the lungs and chest — infections, masses, fluid, general assessment. |
| High-resolution CT (HRCT) | Very fine lung detail — bronchiectasis, interstitial lung disease and fibrosis, emphysema. |
| CT pulmonary angiogram (CTPA) | Uses contrast dye to look for a pulmonary embolism (clot on the lung). |
| Low-dose CT | Lung-cancer screening and nodule follow-up, at a reduced radiation dose.1 |
What it can show
Because of its detail, CT can reveal detail an X-ray cannot: small lung nodules, the pattern and extent of bronchiectasis or lung fibrosis, the distribution of emphysema, blood clots in the lung arteries, enlarged lymph nodes, and the precise size and position of any mass.
What to expect
You lie on a table that slides through a large ring (not an enclosed tunnel like an MRI). It's quick — often under a minute of scanning — and painless. You'll be asked to hold your breath briefly so the images are sharp. Some scans use a contrast dye given through a small cannula in the arm, which can cause a brief warm flush; tell staff about allergies, kidney problems or if you might be pregnant.
Radiation
A chest CT uses more radiation than a plain chest X-ray, so it's reserved for when the added detail is worth it. Your team weighs this up, and low-dose protocols are used where possible.2
How physiotherapists use it
CT findings help physiotherapists understand the pattern and distribution of lung disease — for example, which lobes are affected by bronchiectasis — so airway-clearance and positioning can be targeted precisely. It also confirms diagnoses that shape a rehabilitation plan. As always, imaging is read with the report and combined with hands-on assessment. See Chest X-ray and Principles of Airway Clearance.
References & evidence base
- Cancer Council Australia. National Lung Cancer Screening Program. Sydney: Cancer Council Australia, 2025. Available at: cancer.org.au
- Royal Australian and New Zealand College of Radiologists. Inside Radiology: computed tomography (CT). Sydney: RANZCR, 2024. Available at: insideradiology.com.au
References are numbered in citation order (Vancouver/BMJ style) and were current at the time of writing. Guidelines are living documents — verify against the latest version before clinical use.
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