Скачать или смотреть CT Phantom Testing | Complete Quality Assurance (QA) Procedure for CT Scanner | By Anis Qureshi

In this tutorial, Anis Qureshi demonstrates how to perform phantom testing in a CT scanner — a vital quality assurance process to ensure accurate and safe imaging.




📌 Step-by-Step Procedure:

1️⃣ Purpose of Phantom Testing:

To check CT image quality, calibration, and performance.

Ensure scanner meets safety & diagnostic standards.

Detect early technical issues before patient scans.


2️⃣ Types of CT Phantoms:

Water Phantom: For CT number accuracy, noise, uniformity.

ACR Phantom: For CT number, noise, uniformity, resolution, slice thickness.

Anthropomorphic Phantom: For dose and anatomical simulation.


3️⃣ Preparation:

Turn on CT scanner & let it warm up (as per manufacturer guidelines).

Select appropriate phantom for test.

Place phantom on table centered to gantry isocenter.

Remove all unnecessary objects from scan field.


4️⃣ Positioning:

Align phantom with laser lights in all three planes.

For ACR phantom: Align central slice marker with scanner’s positioning light.

Ensure table height matches isocenter.


5️⃣ Scanning Parameters:

kVp: 120 (or per manufacturer QA protocol)

mAs: 100–200 (as per test requirements)

Slice thickness: 1–5 mm (depending on test type)

Use standard head or body protocol depending on phantom type.


6️⃣ Scanning Process:

Do an NCCT scan of the phantom.

Save raw data and reconstructed images.

Reconstruct axial slices at required thickness.


7️⃣ Measurements & QA Checks:

CT Number Accuracy: Measure HU in water section (should be ~0 HU ± 5).

Uniformity: Compare HU values in center vs periphery.

Noise: Standard deviation of HU in uniform region.

Slice Thickness: Check using ramp or wedge section.

Low Contrast Resolution: Identify smallest visible low-contrast object.

High Contrast Resolution: Identify smallest visible high-contrast lines/spaces.


8️⃣ Recording & Documentation:

Enter all measurements into QA logbook.

Compare with manufacturer & ACR tolerance limits.

If results are out of range → inform service engineer immediately.





🔍 Why This Test Is Important:

Ensures accurate HU measurements.

Confirms image quality for diagnosis.

Reduces patient dose errors.

Maintains compliance with ACR, AERB, or local QA regulations.



🎯 Who Should Watch:
Perfect for Radiology students, X-ray/CT Technicians, Medical Physicists, SSB aspirants, and QA professionals.

📌 Follow for more radiology tutorials:
Instagram: @anisqureshi0




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#CTScan#CTPhantom #CTQA #CTQualityAssurance #CTTesting #CTPhantomTest #Radiology #Radiographer #CTPositioning #HU #CTNoise #CTUniformity #CTResolution #RadiologyTutorial #AnisQureshi #JKSSB #CTMaintenance #ACRPhantom #MedicalPhysics #CTSliceThickness #CTNumberAccuracy



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