Every prior, every finding,one cited view.
RAIN is being built to assemble a patient's prior imaging reports, link each finding across exams, and show how it has changed over time. It is designed to sit beside the current study, with every statement linked to the report sentence it came from.
MRI Brain w/wo contrast · 2025-01-14
Indication: follow-up of treated brain metastases (fictional)| Finding | State | R123-02-10CT | R223-02-12MRI | R323-05-18MRI | R424-02-20MRI | R524-10-08MRI | Today25-01-14MRI |
|---|---|---|---|---|---|---|---|
| treated | 15 mm | 16 mm | 10 mm | 6 mm | 6 mm | to read | |
| growing | — | — | — | 3 mm | 6 mm | to read | |
| new | — | — | — | — | 4 mm | to read | |
| stable | — | 11 mm | 11 mm | 11 mm | 12 mm | to read | |
| resolved | — | 3 mm | 3 mm | — | — | to read |
“The treated right frontal enhancing lesion measures 6 mm, unchanged from 02/20/2024, without new surrounding enhancement or increase in edema.”
MRI Brain w/wo · 2024-10-08“The treated right frontal lesion measures 6 mm, previously 10 mm, with decreased surrounding edema.”
MRI Brain w/wo · 2024-02-20“Status post stereotactic radiosurgery to the right frontal lesion on 03/06/2023, which has decreased in size, now measuring 10 mm, previously 16 mm.”
MRI Brain w/wo · 2023-05-18“There is a 16 mm peripherally enhancing lesion in the right frontal lobe with moderate surrounding vasogenic edema, compatible with metastasis.”
MRI Brain w/wo · 2023-02-12“There is a 1.5 cm hyperdense lesion in the right frontal lobe with surrounding vasogenic edema; MRI with contrast is recommended.”
CT Head w/o · 2023-02-10This paragraph summarizes prior reports only. The radiologist adds the current exam's findings, reviews and edits every statement, and decides what goes into the signed report.
A follow-up read, with the history already in place.
How RAIN is designed to work during a neuroradiology follow-up read.
The follow-up study opens
A brain MRI comes up on the worklist. The patient has five prior exams across two years, and the comparison field lists only the most recent one.
The priors are already assembled
RAIN is designed to retrieve the prior reports ahead of time and order them by date and modality, so there is nothing to search for and no separate window to open.
The timeline shows each finding's course
Each tracked finding sits on one row with its measurements across exams and its current state, so the findings that need attention today stand out.
Every finding links to its source
Select a finding to see the exact sentence from the prior report, with its date and section. If the summary and the source disagree, the source is one click away.
A cited comparison goes into the draft
RAIN proposes a comparison paragraph with a citation for each statement. The radiologist inserts it, edits it and adds today's findings. Nothing enters the report until it is signed.
Six modules, one longitudinal record.
RAIN runs as a pipeline: Retrieve, Connect, Reason and Surface, with Track planned next. Each module has one job in that sequence.
Prior Assembly
Gathers the relevant prior reports and study records before the current study is read.
- Collects prior reports and study metadata: date, modality, body region, protocol
- Filters priors by relevance to the current exam
- Orders exams on one timeline, with gaps and modality changes shown
Finding Graph
Identifies individual findings in each report and links the same finding across exams.
- Extracts findings with location, size and descriptors
- Designed to link the same lesion across reports despite changes in wording or modality
- Designed to keep lesions separate, so a new lesion is not merged into an old one
Temporal Engine
Assigns each linked finding a state over time.
- Classifies findings as new, growing, treated, stable or resolved
- Uses treatment events in reports, such as radiosurgery or resection
- Leaves findings unclassified when the state is uncertain
Evidence View
Shows the source report sentence behind every statement RAIN makes.
- Links each measurement and state to a report, section and verbatim sentence
- Opens the full source report with the sentence highlighted
- Labels any statement without a direct source as unsourced
Comparison Draft
Proposes a cited comparison paragraph for the radiologist to review and edit.
- Writes a short paragraph with citations mapped to specific priors
- Inserts into the report draft only when the radiologist chooses
- Keeps citations visible during editing for verification
Follow-up Tracker
Tracks findings that prior reports recommended for follow-up.
- Records recommendations such as "MRI in 3 months"
- Shows whether the recommended follow-up took place
- Designed to support section-level review of open follow-ups
Built for the reading room.
No extra steps to start
The summary is intended to be ready when the study opens, with no separate search and no uploads.
Sits beside PACS
RAIN is designed to run in a panel beside the viewer and the reporting system. The images stay at the center of the read.
Radiologist in the loop
RAIN proposes and the radiologist decides. Nothing is written to the report without an explicit action, and every sentence can be edited.
Every statement cited
Each measurement, state and sentence links to the prior report text that supports it. Anything RAIN cannot source is designed to be labeled as unsourced.
Designed to fit the systems you already run.
These are design goals. Integration and deployment details will be confirmed with each institution's clinical, informatics and security teams before any deployment.
PACS and RIS integration
Designed to retrieve prior study records through DICOM query and worklist context, and to open beside the current study without a separate login.
Report retrieval
Designed to read prior report text through HL7 v2 messaging or FHIR resources such as DiagnosticReport and ImagingStudy, depending on what the institution supports.
Reporting system handoff
Designed to insert the approved comparison paragraph into the draft at the radiologist's request, using the reporting system's supported integration points.
Deployment and PHI
Planned for deployment inside the health system's infrastructure or a private tenant it controls, with minimum-necessary data, encryption in transit and at rest, and role-based access.
Audit logging
Designed to log each summary generated, each source viewed and each paragraph inserted or edited, with user and time, to support quality review and validation studies.
See RAIN on a neuroradiology follow-up case.
We are opening the neuroradiology module to a small number of institutions. Tell us about your practice and we will set up a walkthrough with our clinical and technical team.