Precise BPO Solution provides outsourced medical image annotation services for healthcare AI teams — bounding boxes, polygons, segmentation masks, and keypoints, labeled to the guidelines you give us. Our in-house team of 540+ in Pune, India has labeled 50M+ medical images and 330M+ video frames across all our projects. Our workflows are aligned with ISO 27001, HIPAA and GDPR requirements.
At a Glance
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Medical image annotation is the process of labeling images and video — X-rays, CT scans, MRIs, ultrasounds, pathology slides, and surgical footage — so AI models have structured examples to learn from. Our team marks regions with boxes, polygons, masks, or keypoints following the labeling guidelines your own team provides; we do not make clinical judgments about the images.
This is the data labeling work behind computer vision models for radiology automation, pathology AI, surgical robotics, and diagnostic imaging research. The work spans bounding boxes for locating structures, pixel-level segmentation for region boundaries, and keypoints for skeletal and dental landmarks. We choose the annotation type with your team, based on your guidelines and the model you're training. Many projects involve DICOM files, and we format the labels to suit your pipeline.
We typically deliver JSON, XML, CSV, or COCO-style annotation files that load straight into your training pipeline.
Since 2017, Precise BPO has provided data labeling services for radiology, pathology, surgical video and EMR structuring teams, working to the guidelines each client gives us. Our Pune delivery center runs around the clock, so work keeps moving across time zones.
Our annotators are trained on your guidelines, and multi-reviewer checks keep labeling consistent across the dataset. We handle X-ray, CT, MRI, ultrasound, PET, mammography, dental imaging, and pathology slides, and we adapt to your annotation platform and output schema.
For high-volume radiology and detection projects, we deliver reviewed labels as bounding boxes, polygons, keypoints, or pixel-level masks. Most clients start with a pilot batch and move to production volumes once the guidelines are settled. Every delivered batch follows your agreed format and is ready to load into your pipeline.
We label organs, tumors, fractures, dental structures, and skin regions, on both long-running radiology programs and short, time-bound datasets. Healthcare AI teams in 27+ countries use our annotation services. We also offer online data entry, medical claims data entry and data de-identification, and can cover them under the same NDA as your annotation work.
We label data for teams building imaging and healthcare AI. These are the kinds of organizations we usually work with.
Boxes and masks on X-rays, MRIs, CT scans and mammograms, for computer-aided detection tools.
Organ, tumor and region outlines for radiology image segmentation datasets.
Labeled images and video for AI in imaging devices, surgical robotics and diagnostic systems.
Labeling support for research teams working with pathology slides and other imaging datasets.
Image and data labeling for predictive models, such as patient monitoring and clinical workflow automation.
Labeled images and EMR text annotation for AI triage and virtual care tools.
Skeletal, dental and joint landmark annotation on X-ray and 3D scan datasets.
Imaging annotation and data structuring for clinical research datasets.
Annotation type affects both model performance and labeling cost. Here is how the three compare for medical work. For a deeper breakdown, see our bounding box annotation guide.
| Criteria | Bounding Box | Polygon | Pixel-Level Segmentation |
|---|---|---|---|
| Shape | Rectangle around organ or lesion | Multi-point shape-following outline | Pixel-level mask per tissue class |
| Best for | Quick localization — tumors, fractures, lesions | Irregular structures — organs, masses, abnormal regions | Detailed region boundaries — radiology & pathology AI |
| Annotation Speed | Fastest — single drag | Moderate — path-tracing workflow | Slowest — pixel-by-pixel |
| Cost Efficiency | Highest — minimal effort per region | High — scales well with volume | Lowest — intensive per image |
| Boundary Precision | Object-level (includes background) | Follows the outline closely | Closest fit to the shape |
| Video / Temporal | Excellent — fast frame tracking | Good — frame-by-frame path tracking | Very high effort per frame |
| Common Use Cases | Tumor localization, fracture detection, organ counting | Organ outlines, irregular masses, surgical planning | Radiology AI, pathology slide analysis, tissue mapping |
| Precise BPO Service | Bounding Box Annotation → | Polygon Annotation → | Semantic Segmentation → |
Not sure which annotation type fits your medical AI project? Talk to our team — we'll recommend an approach based on your modality, model architecture, and dataset requirements.
We label radiology, pathology, surgical video and EMR data for hospitals, medtech companies and AI teams, including large multi-class datasets.
Six steps, from scoping to delivery.
We work with your team to understand imaging modalities, use case, volumes and quality expectations, and agree the scope.
Data arrives over encrypted transfer and is held in access-controlled storage under NDA. If your images contain patient identifiers, they are de-identified before labeling starts, by your team or as a separate service from us.
Our annotators label images and video with bounding boxes, polygons, segmentation masks, and keypoints, working in your platform or ours. Video is labeled frame by frame so labels stay consistent over time.
Each batch goes through the three-stage QA described below. Automated checks flag inconsistencies before human review.
We run sample reviews with you, apply your feedback and update the guidelines.
Final datasets are delivered in JSON, XML, CSV, COCO, or custom formats, via secure transfer. We stay available for updates and dataset versioning, and for fixing anything that doesn't load cleanly into your pipeline.
Examples of organ segmentation, surgical video, report structuring, pathology, and radiograph work, all done to the client's own guidelines.
We work in the annotation tools you already use, or suggest a setup if you don't have one. Exports are DICOM-compatible for radiology archives, and there is no lock-in.
We're a Pune-based data operations company. We started in 2008 as a data entry business and added AI labeling in 2017. Our in-house team of 540+ handles radiology, pathology, surgical video, and EMR labeling, and we take programs from pilot to production.
Start a free pilot →Running since 2008: data entry first, AI labeling from 2017.
Our own annotators, trained on your guidelines and working under NDA. No crowdsourcing.
Access control, NDA-bound staff, and automated security monitoring protect your imagery and datasets.
Three-stage QA: annotator peer review, a label consistency check, and a QA audit against your guidelines.
Delivery from India keeps pricing 40–60% below typical US/UK rates, and the pilot batch is free.
We work in your preferred tooling, such as CVAT, Labelbox, V7, or 3D Slicer, and deliver in whatever format your pipeline needs.
Every batch goes through three stages of checks before delivery. Each stage catches labeling, consistency, and guideline errors early, so they do not compound downstream.
For how we structure review and sign-off, see our annotation governance framework.
If you are weighing outsourcing against building your own team, here is how the options compare. Figures for the other two options are our own estimates.
| Criteria | Hiring In-House | General-Purpose BPO |
Precise BPO
|
|---|---|---|---|
| Annotation Accuracy | Depends on QC setup | Varies by vendor | Target of up to 99.8% — three-stage QA |
| Time to First Delivery | 6–10 weeks (hire, train, tool) | 3–5 weeks | 24–48 hours for a standard batch once guidelines are agreed |
| Scalability for Surge Volumes | Fixed headcount, slow ramp | Limited, delays common | In-house team of 540+, scales with notice |
| Cost | Baseline (salary + infra) | Varies by vendor | 40–60% below US/UK rates |
| Security & Compliance Alignment | Rarely formal | Varies by vendor | Aligned with ISO 27001, HIPAA and GDPR |
| Healthcare Annotation Focus | Limited specialization | Not specialized | Dedicated annotation teams |
| Video / Frame Medical Annotation | Possible but slow | Varies by vendor | Frame-by-frame tracking |
| Free Trial / Pilot | Not applicable | Rarely offered | Free pilot batch, no commitment |
Evaluating multiple providers? Our annotation vendor comparison covers accuracy claims, security credentials and pricing.
Pricing is based on your volume and timeline, with no platform fees and no lock-in. Every engagement starts with a free pilot batch.
Per-image pricing suits defined radiology datasets, one-off pathology annotation projects, and research teams building initial training sets, with a predictable cost per unit.
Per-frame pricing suits surgical robotics datasets, endoscopy review, and ultrasound motion tracking, where frame count is the natural unit of work.
We price by the hour for high-complexity annotation such as multi-organ segmentation, dense histology slides and multi-layer pathology features, where per-image pricing doesn't reflect the effort.
We assign a dedicated medical annotation team at fixed monthly capacity, best for hospitals, medtech companies and AI labs with continuous labeling needs or production diagnostic AI pipelines.
Our India-based delivery center runs 24/7, so teams in every region get coverage during their working day.
Feedback from the healthcare AI, medtech, and research teams we work with.
"Give them a labeling guide and they stick to it. When we added a new class halfway through, they went back and updated the earlier batches without being asked. Extra volume hasn't been an issue."
"About 8 million histology images. Our pathologists wrote the rules, Precise followed them, and we spot-checked batches as they came back. Everything loaded straight into our pipeline with no reformatting, which saved us a week we hadn't planned for."
"We moved our endoscopy footage to Precise partway through a project. Instrument labels looked the same from the first video to the last, and our feedback was turned around quickly."
"For roughly 5 million CT images, the team asked sensible questions about our guidelines before they started. Every batch then arrived on the date they promised, and we were comfortable with how our data was handled throughout."
"Four years in, Precise still works inside our platform like part of our own team. Batches arrive on time and our reviewers rarely send anything back."
"Easy to work with. The security setup was clear from day one, and we use them for both EMR structuring and regular radiology labeling updates. Against an in-house US team, the cost works out well."
Answers to the questions we hear most from healthcare AI teams.
It gives your AI models labeled examples of organs, lesions, regions, and instruments to learn from. Our team marks these with bounding boxes, polygons, segmentation, and keypoints, following guidelines your own clinical or data team provides. We do not provide medical interpretation — the labeling rules and any clinical judgment stay with you. See our guide to data labeling for broader context.
Medical annotation is applied to X-ray, CT, MRI, ultrasound, PET, mammography, dental imaging, pathology slides, and surgical or endoscopy video. Our work is labeling to your class definitions: boxes, polygons, masks, and landmark points. Tasks that need a doctor's judgment, such as deciding whether a finding is abnormal, are best kept with your clinical team. If you also need records keyed in, see our online data entry services.
Labels are what a model trains on and is tested against. Your team uses the organs, regions, fractures or cell clusters we mark to train detection and segmentation models, and a separate labeled set to check how well they perform. The clinical decisions behind the guidelines stay with your experts.
We split large datasets into batches and review each one against your guidelines before delivery. Annotators are trained on your class definitions and modality notes, and the team grows as volume does. Datasets can be updated and versioned in stages as your requirements change.
Medical annotation is used in radiology AI (organ and lesion regions), pathology research (slide regions), surgical robotics (instrument positions), dental imaging (landmarks), dermatology AI (skin lesion regions), and EMR-linked platforms (tagged text).
We keep labeling consistent with written guidelines, reference examples from your team, and class definitions for each modality. Reviewers check boundary placement and continuity across samples, and several reviewers look at the same kinds of structures so they are labeled the same way from batch to batch. For more on how we apply these checks, read our governance guide.
We typically deliver DICOM-compatible exports, COCO-style JSON, XML, NIfTI masks, or custom schemas. These work with imaging viewers and ML pipelines, including 3D Slicer, MONAI, PyTorch, and TensorFlow, so your team can review annotations and use the datasets directly for training or research.
Pricing depends on data volume, modality complexity, the number of anatomical structures, whether the data is video, and how much review is needed. Common models include per-image, per-frame, hourly, or monthly retainer. Our India-based delivery is typically 40–60% below US/UK rates. See our data labeling pricing guide or request a tailored quote.
Our workflows are aligned with ISO 27001, HIPAA and GDPR requirements. All annotators sign NDAs before getting project access, access is permission-scoped by role, and automated security checks run across project environments. Patient-identifiable data is de-identified before annotation begins, either by your team or by us as a separate de-identification service.
Guides on data labeling, annotation governance, pricing and vendor selection.
Send us a sample of your data and we will set up a free pilot or quote the project. If you need other labeling types alongside medical, we can cover them in the same engagement: see our data labeling services.
Get a response within one business day — no commitment required.
Our medical annotation team will review your requirements and respond within one business day.