Choosing a PET-CT centre
Digital PET and Time-of-Flight: — What They Actually Change
If you are comparing PET-CT centres and have come across the terms digital PET or time-of-flight, this page explains what they mean, where the evidence says they help, and what they do not change.
Medically reviewed by Dr. C. Raghavendra Reddy, Medical Oncologist, MBBS (Gold Medal) · DNB · DM (Medical Oncology, Gold Medal) · Last reviewed September 2026
- Real technology differences — Digital PET and time-of-flight are genuine hardware advances, not marketing language.
- Not always clinically decisive — They make the most difference for small lesions and in specific clinical situations.
- Cost may differ — Scans on newer equipment can cost more, but the difference is centre-specific and worth asking about directly.
- The clinical question matters most — The right scan for you depends first on what your oncologist needs to know, not on the scanner model.
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Digital PET scanners use newer detector technology that produces sharper images with less noise. Time-of-flight is a feature that further improves image quality, particularly for detecting small lesions. Both are meaningful advances, but the clinical impact depends on what your scan is looking for and on your body type. Neither replaces a precise clinical question.
CION's PET-CT scans in Hyderabad start at Rs 10,499 — among the lowest published prices in the city, with no hidden charges. Indicative price, as of September 2026.
What are digital PET and time-of-flight?
A conventional PET scanner detects signals from a radioactive tracer using photomultiplier tubes. A digital PET scanner replaces these with silicon photomultiplier detectors, which record when and where each signal arrives with greater precision.
Time-of-flight is a technique that measures the tiny difference in arrival time between the two photons released at each tracer decay event. Knowing that difference tells the scanner more precisely where in the body each event occurred, which reduces image noise.
Together, these features produce images with better contrast and less background noise than older equipment. The Society of Nuclear Medicine and Molecular Imaging (SNMMI) recognises that digital detectors with time-of-flight improve signal-to-noise ratios, and that this advantage is most pronounced when lesions are small or tracer uptake is low.
When does the technology difference matter most?
- Small or low-uptake lesionsDigital PET with time-of-flight is less likely to miss a lesion that a conventional scanner might not show clearly, because lower noise makes faint signals more visible.
- Larger body sizeTime-of-flight provides a greater image quality benefit in people with a larger body habitus, where photon scatter is higher and noise accumulates more.
- Treatment response assessmentDetecting small changes in lesion activity over time is more reliable when background noise is lower — useful for mid-treatment scans.
- Brain and cardiac imagingHigher resolution matters more in areas where anatomy is dense and lesions tend to be small.
- When lying still is difficultSome digital PET protocols achieve equivalent image quality in a shorter scan time, which can help if you find it hard to remain still for the full duration.
PET-CT Partner Centres
PET-CT Scan Centres in Hyderabad
CION offers PET-CT scans through 4 trusted partner PET-CT centres across Hyderabad, so you can choose the one closest to you. Call 18002028726 and we’ll guide you to the earliest available appointment.
PET-CT Centre — Punjagutta
PET-CT Centre — Himayatnagar
PET-CT Centre — Narayanaguda
These are partner diagnostic centres within the CION network. Toll-free booking: 18002028726.
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How does digital PET with time-of-flight compare to conventional PET-CT?
| Feature | Conventional PET-CT | Digital PET-CT with time-of-flight |
|---|---|---|
| Detector technology | Photomultiplier tubes (PMT) | Silicon photomultipliers (SiPM) |
| Time-of-flight included | Not standard | Yes |
| Small lesion sensitivity | Standard | Improved, per SNMMI guidance |
| Image noise at equivalent dose | Higher | Lower |
| Benefit in larger patients | Less pronounced | Greater, due to reduced photon scatter |
| Scan duration | Standard protocols | Can be shorter while maintaining image quality |
| Availability at CION partner centres | Available | Available — confirm when booking |
Did you know?
Time-of-flight PET was described as a concept in the 1980s but only became practical at clinical scale with the development of silicon photomultiplier detectors in the 2010s.
The image quality improvement from time-of-flight scales with patient size — meaning the patients who are hardest to image well on conventional equipment tend to benefit the most from the newer technology.
Source: Society of Nuclear Medicine and Molecular Imaging (SNMMI)
CION does PET-CT in Hyderabad from Rs 10,499 — among the lowest published prices in the city — including an oncologist-reviewed report and a free Rs 950 consultation. Indicative price, as of September 2026.
Explore 88 more Understanding PET-CT, Cost, Booking & Records topics
Choosing a PET-CT Centre & Quality
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- Digital PET and Time-of-Flight: What They Actually Change
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Booking, Access & District Logistics
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Reports, Records & Second Opinions
- Comparing a New Scan With Your Previous One
- Do You Need a Repeat Scan or Just a Re-Read?
- Errors and Corrections in Scan Reports
- Getting a Second Opinion on Your PET-CT Report
- How to Get a Digital Copy of Your PET-CT Images
- Keeping Your Scan Records for the Long Term
- Sharing Your Scan With a Doctor Abroad
- Taking Your PET-CT Report to Another Hospital
- Understanding the Nuclear Medicine Specialist's Role
- What You Receive: Report, Images, CD and DICOM
- What to Do If the Report Says Something You Do Not Understand
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Common questions
Frequently asked questions
Does a digital PET-CT scan find more cancers than a conventional one?
For most standard indications, both give your oncologist the information they need. The difference is most meaningful for small or low-activity lesions, where digital PET with time-of-flight is less likely to return an unclear result. SNMMI guidance acknowledges improved sensitivity for smaller lesions, but this does not mean a well-maintained conventional PET-CT is inadequate for the majority of scans. The clinical question your team is asking — what they are looking for and why — determines how much the scanner generation actually matters for your specific scan.
Does a digital PET-CT scan cost more?
It can, and the difference varies by centre. More recently installed equipment can carry higher running costs, which may be reflected in the scan fee. The difference is not large at every centre, and some protocols run faster on digital equipment, which can partially offset the cost. Ask the imaging centre directly when you book: what is the fee, and is the scanner digital with time-of-flight? That is a routine question and imaging centres expect it.
Should I travel further or pay more to get a digital PET-CT?
For most indications, probably not. If your oncologist has ordered a standard staging or restaging scan, a well-maintained conventional PET-CT at an accredited centre will produce a report your team can act on. The benefit of digital with time-of-flight is real but concentrated in specific situations: small lesion detection, larger patients, and high-precision treatment response assessment. Ask your oncologist whether the specific question your scan is meant to answer is one where the scanner generation makes a meaningful clinical difference.
How do I know which type of scanner I will be scanned on?
Ask directly when you book. Imaging centres know their own equipment and will tell you the scanner model if you ask. Your oncologist or referral centre may also know which scanners a particular imaging facility uses. At CION, PET-CT is coordinated with partner imaging centres rather than done in-house — your care team can tell you which facility is being used for your scan, and you can then ask that facility about their equipment.
Does it matter if my follow-up scan is done on a different scanner from my baseline?
It can matter, yes. When your oncologist is comparing scans over time to measure how well treatment is working, a change in scanner model introduces a variable that can make the comparison harder to interpret. This is worth mentioning to your care team if your follow-up is being arranged at a different facility from your baseline scan. It does not always change the clinical decision, but your oncologist should know so they can take it into account when reading the report.
Is time-of-flight PET available through CION?
CION coordinates PET-CT through partner imaging centres rather than owning and operating scanners directly. The availability of digital PET with time-of-flight depends on which partner centre is used for your scan. Ask your CION care team when your scan is being arranged — they can confirm the equipment at the specific facility, and if the scanner generation matters for your clinical situation, your oncologist can factor that into which centre is used.