Portrait of Masoud Mardanshahi

MiNNOVAA · ZEUS workstation

Masoud Mardanshahi

Senior OpenGL Developer

I build real-time medical volume renderers — GPU ray marching, cinematic path tracing, and 3D workstation tools — for ZEUS, MiNNOVAA’s imaging workstation.

See the latest work LinkedIn

About

Medical graphics, shipped in a PACS viewer

I am a Senior OpenGL Developer at MiNNOVAA with about eight years in industry and five years dedicated to OpenGL. My work sits at the intersection of DICOM, GPU rendering, and clinical 3D tools: taking CT and MR volumes from slice stacks to interactive, high-quality 3D on Windows workstations.

In Vista, the viewer behind ZEUS, I own the OpenGL 3.3 Core pipeline — from 3D textures and transfer functions to a cinematic path tracer with stochastic free-flight sampling, GGX materials, and HDR environment lighting. The same stack powers production DVR, MPR, volume cut, and bounding-box crop, all without leaving OpenGL 3.3.

Based in Tehran, Iran, and open to relocation. I want to work with teams that ship demanding graphics and recognize the people who build them.

Selected work

Rendering for a clinical workstation

Cinematic GPU volume path tracer in the ZEUS workstation: a CT skull rendered with path-tracing compositing, transfer-function controls, and 3D orientation overlay.
Cinematic volume path tracer in ZEUS — stochastic free-flight sampling, GGX / diffuse response, HDR lighting, and progressive accumulation on OpenGL 3.3.

July 2026 · MiNNOVAA ZEUS

OpenGL Rendering Engine for ZEUS

A new cinematic rendering engine for ZEUS, MiNNOVAA’s imaging workstation. It keeps an OpenGL 3.3 Core profile and ObjectTK abstractions for GPU resources, so the same path runs on the workstation GPUs already in the field.

Rays walk the volume with stochastic volumetric free-flight sampling. Hits respond with diffuse and GGX materials, lit by an HDR environment, then accumulate progressively. Transfer functions drive extinction; 3D volume textures feed the march; active-tile filtering skips settled tiles so interaction stays responsive.

Inspired by Mikhail Gorobets’ volume path-tracing work. Original LinkedIn post

  • OpenGL 3.3
  • GLSL 330
  • Path tracing
  • GGX
  • HDR IBL
  • ObjectTK
  • Transfer functions
  • Active-tile filtering
Pipeline from stacked DICOM slices to opaque and translucent 3D skull renders.

GPU Direct Volume Rendering

One-pass ray marching of CT/MR 3D textures with MIP, DVR, and SSD compositing, up to eight masked layers, tricubic sampling, Blinn–Phong lighting, and clinical transfer-function presets. About 10× faster than the previous GDI renderer.

Digital subtraction angiography: contrast vessels isolated from overlapping bone and soft tissue.

Digital Subtraction Angiography

Fo-Dicom to SimpleITK conversion and DSA for XA series. Roughly 2× faster than the prior Leadtools toolkit, which removed an ~$8,000 annual SDK cost.

Interactive 3D MPR

Oblique multiplanar reconstruction inside the live 3D volume: rotatable cross-sections, 2D/3D correlation, bounding-box crop, volume cut, and Camera3D navigation for trauma and surgical planning cases in the PACS viewer.

Experience

Where the work happened

  1. 2021 — Present

    MiNNOVAA

    Senior OpenGL Developer

    • Designed a cinematic GPU volume path tracer for ZEUS: stochastic free-flight sampling, diffuse/GGX response, HDR environment lighting, progressive accumulation, transfer functions, 3D volume textures, and active-tile filtering on OpenGL 3.3 with ObjectTK.
    • Built the production GPU DVR stack: one-pass ray marching, MIP/DVR/SSD, up to eight masked layers, Blinn–Phong shading, tricubic sampling, and transfer-function presets. Real-time 3D of DICOM slices, about 10× faster than GDI.
    • Shipped 3D workstation tools: Camera3D, bounding-box crop, volume cut, layer-box transfer-function editing, and interactive 3D MPR.
    • Integrated OpenTK into ZEUS so 3D data renders on the GPU, and delivered a custom OpenGL camera and renderer that replaced Activiz (.NET VTK).
    • Built Fo-Dicom to SimpleITK conversion and DSA, about 2× faster than Leadtools, saving roughly $8,000 per year in SDK cost.
    • Released Faraabeen, a DICOM viewer that can decrypt Kekishe encrypted studies, keeping that capability inside MiNNOVAA products.
    • Ray-cast volume rendering contributed to more than 20% sales growth in a 90-day period versus the same period the year before.

  2. 2019 — 2021

    Roundium

    Real-time Image Processing Scientist

    Built a pipeline for optical head-position tracking plus pupil tracking to estimate gaze. Mean accuracy of 2°, matching contemporary research systems, in real time on a custom eye-tracker.

  3. 2018 — 2019

    Tehran Jarrah Novin

    3D Modeling / 3D Printing Engineer

    3D modeling and printing for a medical-engineering company, including support around Covidien and Medtronic devices.

  4. 2016 — 2018

    K. N. Toosi University of Technology

    M.Sc. Biomedical Engineering

    Thesis: Design and construction of an eye-tracking system.

  5. 2009 — 2014

    Shahid Rajaee University

    B.S. Electrical Engineering

Skills

What I use every week

Graphics

  • OpenGL 3.3 Core
  • GLSL 330
  • OpenTK
  • ObjectTK
  • Volume rendering
  • Path tracing
  • Transfer functions
  • MPR

Languages & platforms

  • C#
  • .NET 4.7.2 / .NET 6
  • C++
  • Python
  • WinForms
  • WPF

Medical imaging

  • DICOM
  • fo-dicom
  • SimpleITK
  • DSA
  • CT / MR / XA

Contact

Get in touch

If you want to talk about graphics, medical visualization, or a role that needs both — write or call.

[email protected] +98 903 123 1991 linkedin.com/in/mmardanshahi github.com/mardanshahi