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CT scan simulators for students

Training software that reproduces a diagnostic CT console: topogram, kV, mAs, pitch, contrast timing, reconstruction and dose. How it differs from a radiotherapy CT simulator, and what the evidence says.

By the ScanFlo Editorial Team · Updated

In this section · Simulation

A CT scan simulator for students is software that reproduces a diagnostic CT console. You plan the scan range on a topogram, set kV, mAs, pitch and slice thickness, time the contrast, reconstruct with different kernels, and see what each choice does to image noise and to dose (CTDIvol and DLP), without a scanner or radiation. It is not the radiotherapy "CT simulator", which is a real scanner used to plan treatment.

90%
of Italian radiographers felt aware of radiation protection
12.1%
attended radiation protection courses regularly
68%
of RT students said VR CT simulation helped them learn
25–60%
dose reduction reported for AEC plus iterative recon

Sources: Paolicchi et al. (2016); Gunn et al. (2021); Malik et al. (2024).

CT scan simulator or CT simulator: which do you mean?

Two different things share the name. Diagnostic radiography students want training software; radiotherapy departments mean a scanner.

Two meanings of 'CT simulator'

CT scan simulator (training)
Software that reproduces a diagnostic CT console: topogram, protocol, contrast, reconstruction and dose, for students and technologists.
CT simulator (radiotherapy)
A real CT scanner that images patients in treatment position so beams can be planned. Quality-assured under AAPM Task Group 66.

Radiotherapy centres describe CT simulation as "a specialized imaging procedure used to precisely plan radiation therapy treatments" (Revere Health), and the AAPM's Task Group 66 report sets out quality assurance for those scanners (Mutic et al., 2003). Everything below is about the training kind.

What does a CT scan simulator teach?

The decisions a CT technologist makes on every scan, in the order they make them.

One CT exam on a simulator

  1. STEP 01
    Topogram
    Acquire the localizer and set the start and end of the range.
  2. STEP 02
    kV and mAs
    Tube potential and tube current-time product, or automatic exposure control.
  3. STEP 03
    Pitch and slice
    Table travel per rotation against beam width; collimation and thickness.
  4. STEP 04
    Contrast timing
    Bolus tracking: a region of interest and an HU threshold that triggers the scan.
  5. STEP 05
    Reconstruction
    Kernel and window: soft tissue, lung or bone from the same raw data.
  6. STEP 06
    Dose readout
    CTDIvol and DLP after every scan, against a reference level.
Terms as defined in the AAPM CT Lexicon v2.0.
The console terms, in the AAPM's words
TermWhat it means
TopogramThe localizer radiograph used to prescribe the start and end of the scan range (also called scout, scanogram or surview).
kVTube potential: the voltage that accelerates electrons towards the target.
mAsTube current-time product per rotation.
PitchTable travel per rotation divided by total nominal beam width.
AECAutomatic exposure control: adapts tube current to patient size for a set image quality.
KernelThe reconstruction property that sets sharpness or smoothness in the axial plane.
Bolus trackingStarts the scan automatically when contrast in a region of interest reaches a threshold.

Pitch is a good example of what a simulator makes visible. Radiopaedia summarises the trade-off: a pitch above 1 lowers dose but also image quality, while a pitch below 1 improves image quality at a higher dose (Radiopaedia, pitch). On a simulator you change it and watch both happen.

ScanFlo CT · exam cockpit

ScanFlo CT exam cockpit with a lateral head topogram and the planned scan range, an axial preview, and the protocol card showing mA, kV and slice thickness beside live CTDIvol and DLP.
ScanFlo CT: plan on the topogram, set kV and mAs, and read CTDIvol and DLP as they change.

Why dose teaching matters

Because many people who order and run CT scans underestimate the dose, and the console numbers are easy to misread.

Radiation protection: confidence vs practice

Italian radiographers who felt aware of radiation protectionn = 780, 2016
90%
Emergency physicians who knew abdominal CT vs chest X-ray doseKorea, 2015
48.6%
Emergency nurses who knew the sameKorea, 2015
28.9%
Indian clinicians who knew referral guidelinesPunjab, 2015
30.1%
Italian radiographers attending regular radiation protection coursesn = 780, 2016
12.1%
Different populations and questions, shown together to make one point. Sources: Paolicchi et al., Insights into Imaging 2016; Lee et al., Clin Exp Emerg Med 2015; Singh et al., J Nat Sci Biol Med 2015.

Read the console numbers carefully. CTDIvol is CTDIw divided by pitch, and DLP is CTDIvol multiplied by scan length, but neither is the patient's actual absorbed or effective dose (Radiopaedia, CT dose index). In India, AERB's safety code requires the CT console to display and record CTDI, DLP and exposure parameters, and asks practitioners to stay in line with international reference levels or those the regulator recommends (AERB RF-MED/SC-3).

Head CT, CTDIvol (mGy): Indian surveys vs an international figure

Kerala, 7 hospitals, 75th percentile2018
68.1
International reference citedas cited, 2024
60
South India, proposed DRL110 sites, 2016
47
Regional surveys, not national reference levels: a 2018 study noted India did not yet have national CT DRLs. Sources: Varghese et al., IJRI 2018; Saravanakumar et al., IJRR 2016; Malik et al., Diagnostics 2024.

Does CT simulation training work?

Early studies are encouraging on knowledge and confidence, and they show transfer depends on how close the simulator is to the scanner students meet.

Remote equals local
62 students learning CT via high-fidelity simulation showed no knowledge difference between remote and on-site groups (Lee et al., 2020).
Students feel it helps
68% of radiation therapy students agreed VR CT simulation helped them learn CT (Gunn et al., 2021).
Similarity matters
Students whose placement scanner resembled the simulator were more likely to believe their learning transferred (Lee and McInerney).
Cost of the real thing
Universities face the immense cost of an onsite CT scanner (Taylor et al., 2023).
Students' learning can be optimised by repetitive practice in a safe environment and can be associated with increase student clinical confidence.
Gunn, Rowntree, Starkey and Nissen, Journal of Medical Radiation Sciences, 2021. Source

ScanFlo CT · MPR and 3D

ScanFlo CT MPR workspace with axial, coronal and sagittal abdomen reformats, a linked crosshair, and a 3D bone volume render of the spine and pelvis.
After the scan: reformat any plane and render the volume. Post-processing is part of the job, and part of the simulator.

What to look for in CT training software

Real topogram planning, kV, mAs, pitch and AEC that change both noise and the dose readout, bolus tracking with a threshold you set, reconstruction kernels on the same raw data, and cases built from real patient scans. If it runs in a browser, the whole batch can practise at once.

Try it on the console

Try a CT scan simulator in your browser

ScanFlo CT: plan on the topogram, set the protocol, time the contrast and watch CTDIvol and DLP respond.

Start free →

Related: CT dose metrics, contrast timing and bolus tracking, and the radiography simulation guide.

Frequently asked questions

Is a CT scan simulator the same as a CT simulator in radiotherapy?

No. In radiotherapy, a CT simulator is a real CT scanner used to image patients in treatment position so physicists can plan radiation beams. A CT scan simulator for students is training software that reproduces a diagnostic CT console without a scanner or radiation.

Does CTDIvol tell me the patient's dose?

Not exactly. CTDIvol and DLP describe the scanner's output measured in a standard phantom. They are the right numbers to compare protocols and check against reference levels, but they are not the absorbed or effective dose for an individual patient.

Does India have national CT diagnostic reference levels?

A 2018 study in the Indian Journal of Radiology and Imaging stated that India did not yet have national or region-specific CT reference levels. Regional surveys have proposed values since, and AERB's safety code asks practitioners to stay in line with international reference levels or those the regulator recommends.

Can I learn contrast timing on a simulator?

Yes, the logic of it: when to start monitoring, where to place the region of interest, which threshold in HU triggers the scan, and what happens to arterial and venous enhancement if you start too early or too late. Injecting a real patient stays a supervised clinical skill.

Do I need a VR headset for CT simulation?

No. A narrative review found immersive VR improved confidence and motivation, but noted it is still debated whether VR teaches CT better than computer-based simulation. A browser simulator on a lab computer covers the console decisions.

Sources

Every figure on this page links back to one of these.

  1. Mutic S, et al. Quality assurance for computed-tomography simulators and the computed-tomography-simulation process: AAPM TG-66. Medical Physics, 2003
  2. Revere Health. CT simulation
  3. AAPM. CT terminology lexicon, version 2.0, 2022
  4. Radiopaedia. Pitch
  5. Radiopaedia. CT dose index
  6. AERB. Safety code AERB/RF-MED/SC-3 (Rev. 2)
  7. Varghese B, et al. Radiation dose metrics in multidetector CT examinations: a multicentre study from seven tertiary care hospitals in Kerala. IJRI, 2018
  8. Saravanakumar A, et al. Establishment of CT diagnostic reference levels in select procedures in South India. IJRR, 2016
  9. Malik MMUD, et al. An analysis of computed tomography diagnostic reference levels in India compared to other countries. Diagnostics, 2024
  10. Paolicchi F, et al. Assessment of radiation protection awareness and knowledge about radiological examination doses among Italian radiographers. Insights into Imaging, 2016
  11. Singh P, et al. A prospective study assessing clinicians attitude and knowledge on radiation exposure to patients during radiological investigations. J Nat Sci Biol Med, 2015
  12. Lee JH, et al. Perception of radiation dose and potential risks of computed tomography in emergency department medical personnel. Clin Exp Emerg Med, 2015
  13. Gunn T, et al. The use of virtual reality computed tomography simulation within a medical imaging and a radiation therapy undergraduate programme. JMRS, 2021
  14. Lee K, et al. Computed tomography learning via high-fidelity simulation for undergraduate radiography students. Radiography, 2020
  15. Lee K, McInerney J. Transferability of learning from computed tomography simulation into clinical practice: student perspectives. Interactive Learning Environments
  16. Taylor B, McLean G, Sim J. Immersive virtual reality for pre-registration computed tomography education of radiographers: a narrative review. JMRS, 2023
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