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Murali RaviMedical Instrumentation

Sri Sathya Sai Institute of Higher Learning

Making cancer visible in the operating theatre.

Dr. Murali Ravi builds indigenous medical imaging instruments: gamma cameras small enough to hold, fast enough to read in real time, and accurate enough to trust while a patient is still on the table.

Explore the researchFunded projects
Research funding
₹570LResearch funding
Funded projects
6Funded projects
Citations
49Citations
Portrait of Dr. Murali Ravi

Dr. Murali Ravi

Assistant Professor, Department of Physics

Supported by

  • DST
  • DAE-BRNS
  • NOKIA Corp.
  • Analog Devices
  • BARC

Headline results

Four numbers that define the work.

₹0Lakhs

Research funding awarded

Across six sponsored projects from DST, DAE-BRNS, NOKIA and Analog Devices.

0×

MLEM reconstruction speed-up

Xilinx Virtex-7 VC709 FPGA versus optimised software on an Intel Xeon workstation.

0%

Clinical correlation

SAIGC matched gold-standard large field-of-view gamma cameras in trials.

0mm

Intrinsic spatial resolution

1,936 CZT detector elements in a 44 × 44 matrix across an 88 × 88 mm field.

Featured research

Four instruments, one conviction.

That a diagnostic capability is only real when it reaches the room where the decision gets made.

CONVENTIONAL: INDIRECTγCollimatorScintillator (NaI / LaBr₃)Light guidePhotomultiplier arrayReadout electronics~204 mmDETECTOR DEPTHSAIGC: DIRECT CONVERSIONγLEHR collimatorCZT: direct conversionASIC readoute⁻ charge~110 mmDETECTOR DEPTHWHY IT MATTERSNo light stage. No PMT depth.Room temperature · portable form factorCZT SELECTED AFTER GEANT4 / GATE MONTE CARLO COMPARISON AGAINST LaBr₃ SCINTILLATORS
Clinically validated

Direct conversion detector architecture

CZT converts gamma photons straight to charge: no scintillator, no photomultiplier, no depth. This is the decision that makes the camera portable.

Open SAIGC

Selected contributions

A record built one instrument at a time.

88 mm88 mm44 × 44MATRIX1,936ELEMENTS2 mmPITCH2 mmRESOLUTIONCOLLIMATIONLEHR adaptorLow Energy High ResolutionPinholeParathyroid & focused studies
Doctoral work2016 to 2021

Small Area Imaging Gamma Camera

A portable CZT gamma camera at 2 mm intrinsic resolution across an 88 by 88 mm field. Five times better in image detail, ten times cheaper than the market, validated at 100 percent correlation with gold-standard systems.

Open the case study

Funded research

₹0Lakhs

6 sponsored projects, 2012 to 2027

Medical & Gamma Imaging₹274L
Hardware Accelerationn/a
Voice Biometrics & Edge AI₹6L
Optical Networks & AI/ML₹290L

Hardware acceleration

0×

MLEM reconstruction on a Xilinx Virtex-7 VC709, against optimised software on an Intel Xeon workstation.

IEEE Access, 2019 · 44 citations

Principal Investigator

SAIGC-Torch

Dual-modality intraoperative navigation. ICG fluorescence at 780 nm finds the margin, technetium-99m gamma at 140 keV finds the node. The three-day wait for histopathology becomes a decision made during the operation.

100 percent detection in oral, throat and breast cancer trials

SURGICAL FIELDTUMOUR MARGINSENTINEL NODEOPTICAL780 nmGAMMA140 keVSAIGC-TORCHICG FLUORESCENCEWhere does the tumour end?⁹⁹ᵐTc GAMMAWhere has it spread?COMPLEMENTARY, NOT REDUNDANT: FLUORESCENCE READS THE VISIBLE SURFACE MARGIN; GAMMA REACHES DEPTH AND METABOLIC ACTIVITY.CHANNEL 01: OPTICALIndocyanine GreenExcited at 780 nm · high sensitivityCHANNEL 02: NUCLEARTechnetium-99m140 keV · nodal & metabolic

Publication record

0

Papers

0

Citations

0

Journals

  • Development of 2D Scintillator Array from CsI:Tl Single Crystal for Gamma Imaging
  • Data acquisition and optimization for low latency gamma imaging
  • Development of 2D CsI:Tl Single Crystal Scintillator Array for Gamma Imaging

Edge AI

Voice biometrics that never leave the device

ECAPA-Lite with a novel lightweight prosody encoder. 2.17 percent EER on VoxCeleb1, quantised to 1.57 MiB for the ARM Cortex-A55.

With Analog Devices India · 2025 to 2026

Research domains

Four fields, one method: build the instrument.

Instrumentation

Medical & Gamma Imaging

₹274L

Indigenous gamma cameras and intraoperative probes that bring nuclear imaging to the bedside and the operating theatre.

3 funded projects, 2012-2023

FPGA · DSP

Hardware Acceleration

Research

Removing the computational bottleneck that keeps iterative reconstruction out of real-time clinical practice.

Research programme

Embedded ML

Voice Biometrics & Edge AI

₹6L

Speaker verification accurate enough to trust and small enough to run on a microcontroller-class processor.

1 funded project, 2025-2026

Industry Programme

Optical Networks & AI/ML

₹290L

Applying machine learning to optical network design, algorithm development and hardware manufacturing at industrial scale.

2 funded projects, 2025-2027

Research journey

Fourteen years, traced.

From rebuilding a planar gamma camera in 2012 to leading industrial AI and ML programmes in 2026. Select any entry to expand it.

  1. 2012
  2. 2015
  3. 2016
  4. 2016
  5. 2017
  6. 2017
  7. 2019
  8. 2019
  9. 2020
  10. 2021
  11. 2022
  12. 2023
  13. 2023
  14. 2025
  15. 2026

The full record: publications, patents, projects and prototypes.

Publications

9 papers, 49 citations

Patents and IP

Product and design filings

Funded projects

₹570 Lakhs across 6

Assistant Professor, Department of Physics · Get in touch