FDA-cleared profile

SubtleMR (2.3.x)

Subtle Medical Inc.

MRI image enhancement by reducing image noise for head, spine, neck, abdomen, pelvis, prostate, breast, and musculoskeletal MRI, or increasing image sharpness for head MRI.

Evidence status: each field states its source quality, applicability, and review date. Research pending, information not established, and vendor documentation pending remain distinct outcomes.

Clinical details

What this tool is for

Start with the authorized purpose, then verify how it fits your service line and reading workflow.

Exact purpose
MRI image enhancement by reducing image noise for head, spine, neck, abdomen, pelvis, prostate, breast, and musculoskeletal MRI, or increasing image sharpness for head MRI.
  • FDA source
  • Exact FDA submission
  • Checked 2026-09-09
Intended users
Radiologists in an imaging center, clinic, or hospital.
  • FDA source
  • Exact FDA submission
  • Checked 2026-09-09
Care setting and population
Imaging center, clinic, or hospital MRI workflow.
  • FDA source
  • Exact FDA submission
  • Checked 2026-09-09
Workflow role
Post-acquisition image processing; the end user selects noise reduction or sharpness enhancement through the DICOM Series Description, a command-line argument, or an environment variable.
  • FDA source
  • Exact FDA submission
  • Checked 2026-09-09
Required input
Standard-of-care MRI images acquired on 1.2 Tesla, 1.5 Tesla, or 3 Tesla scanners; the subject device processes DICOM files and additionally can process images communicated over ISMRMRD raw-data format.
  • FDA source
  • Exact FDA submission
  • Checked 2026-09-09
Output and human action
MRI images with reduced noise or increased sharpness, with image quality changes evaluated through signal-to-noise ratio, small-structure visibility, anatomic-structure thickness, and boundary sharpness.
  • FDA source
  • Exact FDA submission
  • Checked 2026-09-09
Limitations
The device has no user interface and operates as a fixed nonlinear filter whose parameters depend on the selected enhancement. The packet establishes 1.2T, 1.5T, and 3T MRI inputs but does not identify scanner manufacturers, PACS compatibility, or a broader diagnostic-performance claim.
  • FDA source
  • Exact FDA submission
  • Checked 2026-09-09

Regulatory identity

FDA record and catalog context

The FDA listing establishes the regulatory identity. It does not by itself establish local workflow fit, pricing, security, or performance in your environment.

FDA submission
K223623
  • FDA source
  • Exact FDA submission
  • Checked 2026-08-31
Modality
MRI
  • FDA source
  • Exact FDA submission
  • Checked 2026-09-09
Anatomy
Head, spine, neck, abdomen, pelvis, prostate, breast, and musculoskeletal regions
  • FDA source
  • Exact FDA submission
  • Checked 2026-09-09
Clearance type
510(k)
  • FDA source
  • Exact FDA submission
  • Checked 2026-08-31
Decision date
2023-05-11
  • FDA source
  • Exact FDA submission
  • Checked 2026-08-31
FDA status
FDA-cleared
  • FDA source
  • Exact FDA submission
  • Checked 2026-08-31

Implementation

Questions for IT, informatics, and operations

Use these fields to structure a vendor demo, security review, and implementation estimate.

Integration
The FDA packet describes operation on DICOM files on a file system, storage of enhanced images on the file system, and additional ISMRMRD raw-data processing; it does not establish PACS, RIS, EHR, interface-version, or local compatibility.
  • FDA source
  • Exact FDA submission
  • Checked 2026-09-09
Deployment and data flow
Vendor documentation pending
  • Vendor confirmation
  • Exact FDA submission
  • Checked 2026-09-09

The reviewed sources do not establish the current exact-release hosting topology, data flow, region, tenancy, or disaster-recovery configuration.

Security and privacy
Vendor documentation pending
  • Vendor confirmation
  • Exact FDA submission
  • Checked 2026-09-09

Exact-release security controls, data retention, hosting boundaries, and scoped assurance documentation require vendor confirmation.

Training and support
Vendor documentation pending
  • Vendor confirmation
  • Exact FDA submission
  • Checked 2026-09-09

Current training prerequisites, competency checks, and support commitments for the exact configuration require vendor confirmation.

Monitoring and change control
Vendor documentation pending
  • Vendor confirmation
  • Exact FDA submission
  • Checked 2026-09-09

Current drift, quality, uptime, alert, escalation, and incident-response commitments for the exact configuration require vendor confirmation.

Supported acquisition environment

Scanner manufacturers: All

exact submission · checked 2026-09-01

Confirm currently supported software versions, protocols, and site-specific acquisition configurations.

ACR exact-submission catalog context

ACR AI Central provides an exact-submission model card for SubtleMR (2.3.x); FDA labeling remains controlling for clinical use, limitations, and performance.

exact submission · checked 2026-09-09

Evidence

Performance evidence

Metrics are shown only when they are tied to a source, endpoint, population, and tested product version. Candidate literature without exact product and version linkage is not shown as product evidence.

Evidence summary
FDA software verification and validation included a retrospective clinical-data study divided into noise-reduction and sharpness-enhancement tests. Noise reduction required average ROI signal-to-noise improvement of at least 5% and non-inferior small-structure visibility by Likert assessment; the test passed. Sharpness enhancement required improved anatomic-structure thickness and boundary sharpness in at least 90% of test datasets; the test passed. The packet text does not state the study sample sizes.
  • FDA source
  • Exact FDA submission
  • Checked 2026-09-09
Reported sensitivity
Research pending
  • Needs research
  • Exact FDA submission
  • Checked 2026-08-31

This field has not been curated yet.

Reported specificity
Research pending
  • Needs research
  • Exact FDA submission
  • Checked 2026-08-31

This field has not been curated yet.

No contextualized exact-version metric has completed evidence review. Regulatory-document values, when available, are shown above with their limitations.

SubtleMR (2.3.x) regulatory performance study summary

  • DesignStand-Alone Performance
  • PopulationPopulation described in the exact-submission ACR model card
  • Scopeexact submission
  • Tested versionExact product version not reported; regulatory study summarized for FDA submission K223623
  • IndependenceIndependence not established

K223623

ACR AI Central summarizes the regulatory study; consult the exact FDA materials before comparative use.

Costs and setup

Budget and ongoing governance

These are common procurement questions; unknown values remain visible until a source supports them.

Pricing and total cost
Vendor documentation pending
  • Vendor confirmation
  • Exact FDA submission
  • Checked 2026-09-09

No public price or quote for the exact K223623 configuration was established in this review.

Reimbursement and coding
Not established in reviewed sources
  • Reviewed sources checked
  • Exact FDA submission
  • Checked 2026-09-09

No exact-product payer policy, coding instruction, or payment determination was established; eligibility must be evaluated by payer, site of service, and use case.

Safety and lifecycle

Postmarket record

Recall and adverse-event records are shown only after product matching. Adverse-event reports do not establish incidence or causality.

Postmarket safety review
The exact-identifier FDA recall query returned no native recall record for K223623. This limited result does not establish absence of recalls or other safety information and does not cover later versions, family records, MAUDE reports, corrections, or field notices.
  • Public source
  • Exact FDA submission
  • Checked 2026-09-09

Buyer worksheet

Open questions to take to the vendor

Open evaluation checklist

Research record

What has been checked

This audit distinguishes completed source review from fields that have not yet been researched.

Exact FDA record reviewedStatus
2026-09-09Last searched
20Fields reviewed
9Source classes checked
2Awaiting review PubMed leads
0Awaiting review trial leads
0Unreviewed FDA recall leads

Exact-submission ACR model-card fields were normalized under the current provenance rules; vendor and independent-study confirmation remain distinct. Exact FDA scope controls clinical claims. ACR provides bounded exact-submission catalog context. Candidate literature metadata remains a discovery queue until full-text identity, endpoint, population, and version review is completed. Automated exact-name discovery found 2 PubMed and 0 ClinicalTrials.gov candidate records. Candidates require human product and version matching; zero candidates is not evidence that no studies exist. Native FDA recall identifiers produced 0 postmarket candidate records; 0 have been reviewed (0 published, 0 rejected) and 0 remain unreviewed.

Candidate leads remain unpublished until a human confirms the exact product and tested version.

Source classes: fda ai list, fda decision summary, acr ai central product, fda device recall, literature index, trial registry, pubmed, clinical trials, openfda device recall

Sources & history

How this profile was documented

Open the ledger for source dates, scope, and research-record updates.

View source ledger and history

Source ledger

  1. FDA K223623: SubtleMR (2.3.x)

    U.S. Food and Drug Administration - Published 2023-05-11 - Accessed 2026-09-09

    Scope: identity, clinicalUse, modality, anatomy, workflow, evidence, implementation

  2. Artificial Intelligence-Enabled Medical Devices

    U.S. Food and Drug Administration - Accessed 2026-08-31

    Scope: regulatoryIdentity, modalityContext

  3. SubtleMR (2.3.x) model card (K223623)

    American College of Radiology - Published 2026-08-17 - Accessed 2026-09-01

    Scope: intendedUsers, output, limitations, evidenceSummary, anatomy, evidenceStudies, implementationCapabilities

  4. PubMed biomedical literature index

    U.S. National Library of Medicine - Accessed 2026-09-01

    Scope: evidenceDiscovery

  5. ClinicalTrials.gov study registry

    U.S. National Library of Medicine - Accessed 2026-09-01

    Scope: evidenceDiscovery, studyStatus

  6. openFDA Device Recall API

    U.S. Food and Drug Administration - Accessed 2026-09-02

    Scope: recallDiscovery, nativeSubmissionMatching

  7. openFDA exact recall query for K223623

    U.S. Food and Drug Administration - Accessed 2026-09-09

    Scope: postmarketSafety

Research history

  1. K223623 FDA decision

    Regulatory record

    510(k)

  2. Source-review record updated

    Research record

    fda record reviewed

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