SubtleSYNTH (1.x)

by Subtle Medical  · Based in United States → — AI-powered technology for faster, safer and smarter medical imaging.
Neurology Orthopedics Radiology
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Regulatory Status Disclosed

Overview

SubtleSYNTH is an AI-driven software solution developed by Subtle Medical that leverages deep learning to generate synthetic STIR (Short Tau Inversion Recovery) images from already-acquired T1 and T2 weighted MRI contrasts. This innovative tool creates synthetic STIR images with zero acquisition time, making them fully interchangeable with conventionally acquired STIR images. Initially validated for use in spine imaging, Subtle Medical has plans to expand the technology to brain and musculoskeletal (MSK) imaging in future releases. SubtleSYNTH aims to significantly enhance operational efficiency in radiology workflows, reduce the need for rescans often caused by motion artifacts, and alleviate the workload on radiologists and technologists, thereby improving overall patient care and experience. It is part of Subtle Medical’s suite of AI solutions designed to optimize imaging workflows and improve productivity.

Reviewed by Pouyan Golshani, MD — Interventional Radiologist

Key Features

  • Generates synthetic STIR images (SynthSTIRs)
  • Achieves zero acquisition time for STIR images
  • Utilizes deep learning from T1 and T2 weighted MRI contrasts
  • Synthetic images are interchangeable with conventionally acquired STIR images
  • Initially validated for spine imaging, with plans for brain and MSK expansion
  • Enhances operational efficiency in radiology workflows
  • Reduces the need for rescans due to motion artifacts
  • Eases workload on radiologists and technologists
  • Part of the Subtle-ELITEu2122 package for comprehensive MRI enhancement
  • Vendor-neutral software solution

Use Cases

  • Accelerating MRI workflows and reducing scan times
  • Improving patient experience during MRI procedures
  • Enhancing diagnostic confidence through high-quality synthetic images
  • Optimizing existing MRI scanner utilization and throughput
  • Reducing manual effort in image processing and alignment
  • Addressing procedure backlogs and long wait times in MRI departments

What Physicians Need to Know

DICOM Support & Standards
SubtleSYNTH integrates within the Subtle Medical product ecosystem, which implements DICOM services for anonymization, transfer, storage, processing, and return of DICOM images. It supports MR Image Storage and sends generated SynthSTIR images back to PACS or other DICOM nodes via a compatible Medical Device Data System (MDDS).
PACS Integration Method
The software is a post-processing solution designed for seamless integration into any radiology workflow and across all MRI vendors and PACS. Images are sent from the MR scanner to a compatible MDDS via DICOM, processed by SubtleSYNTH, and then returned to PACS for clinical review.
Reading Room Workflow Impact
SubtleSYNTH significantly enhances operational efficiency by generating synthetic STIR images with zero acquisition time, effectively eliminating the need for a dedicated STIR sequence. This leads to substantial time savings, reduced need for rescans due to motion artifacts, eased workload for radiologists and technologists, increased scanner throughput, and reduced patient wait times.
AI Model Architecture (deep learning approach)
SubtleSYNTH utilizes a deep learning (DL) approach, specifically a convolutional neural network-based algorithm, to synthesize STIR images from already-acquired T1 and T2-weighted MRI contrasts.
Processing Speed (per study)
The tool achieves 100% acceleration for STIR sequences by generating synthetic STIR images with zero acquisition time. When combined with SubtleMR, it can contribute to overall MRI acquisition speed-ups of up to 60%.
FDA Clearance Pathway (510k/De Novo)
SubtleSYNTH (1.x) received U.S. FDA 510(k) clearance as a Class II medical device (Product Codes: QIH, LNH).
Supported Modalities
The tool is designed for Magnetic Resonance Imaging (MRI). Its initial commercial release is validated for spinal imaging, with future expansions planned for brain and musculoskeletal (MSK) imaging.
Sensitivity & Specificity Data
Studies have shown that synthetic STIR images generated by SubtleSYNTH are interchangeable with conventionally acquired STIR images and are diagnostically equivalent or superior in image quality. Its use for spinal imaging has been validated in a study published in the American Journal of Neuroradiology (AJNR).
RSNA/ACR Validation
SubtleSYNTH has been featured at RSNA, with new results from peer-reviewed publications and real-world pilots presented at RSNA 2023. A study validating its use in spinal imaging was published in AJNR, and research in JACR demonstrated superior image quality or diagnostic equivalence to conventionally acquired STIR images.
Physician Tip

SubtleSYNTH can significantly streamline MRI workflows by eliminating the need for a dedicated STIR sequence, thereby reducing scan times and potentially improving patient comfort and throughput. Radiologists should be aware that the synthetic STIR images are designed to be diagnostically equivalent to conventionally acquired images, allowing for consistent interpretation. This tool is particularly beneficial for high-volume practices looking to optimize MRI scanner utilization and reduce motion artifacts.

SubtleSYNTH integrates seamlessly as a post-processing software within existing radiology workflows. It operates by receiving T1 and T2-weighted DICOM images from the MR scanner via a compatible MDDS and then sending the generated synthetic STIR images back to the PACS or other DICOM nodes for review. This vendor-neutral approach ensures compatibility across various MRI scanner manufacturers and PACS systems, minimizing disruption to current infrastructure.

Details

Category Radiology & Imaging AI
Pricing Contact for pricing
DeploymentSoftware solution that integrates with existing, vendor-neutral MRI scanners.
Compliance
BAA AvailableUnknown AI-estimated
HIPAA CompliantUnknown AI-estimated
FDA Status 1 AI-estimated

SubtleSYNTH (1.x) received FDA clearance (K241329) on July 11, 2024, for generating synthetic STIR images from already-acquired T1 and T2 weighted MRI contrasts, initially validated for use in the spine.
Integrations
EHR Not specified
Specialties Neurology, Orthopedics, Radiology

What the Web Says

SubtleSYNTH (1.x) is an AI-powered software that generates synthetic STIR MRI images from existing T1 and T2 weighted contrasts, effectively creating STIR images with zero acquisition time. It has received FDA clearance and is designed to enhance operational efficiency, reduce scan times, and improve image quality in MRI procedures, initially validated for spinal imaging. The software operates in the background without a user interface and is intended for use by radiologists in various clinical settings.

Overall: Positive

Strengths

  • Generates synthetic STIR images with zero acquisition time, significantly improving workflow efficiency.
  • Validated for spinal imaging, with plans to expand to brain and musculoskeletal imaging.
  • Reduces the need for rescans due to motion artifacts.
  • Aims to ease the workload on radiologists and technologists.
  • Compatible with any vendor, make, or model of MRI scanner when used with SubtleMR software.
  • Does not increase cybersecurity risk as the device itself is not networked.

Limitations

  • No specific cons were found in the provided search results.
  • Limited to spinal imaging in its initial release, though expansion is planned.

Based on reviews from: accessdata.fda.gov, Axis Imaging News, Medimaging.net, AuntMinnie, PR Newswire, MDPile

Last updated: 2026-07-19

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Press & Coverage

PR Newswire
Subtle Medical Receives FDA-Clearance for Industry First AI-powered Synthetic Imaging Software, SubtleSYNTHu2122
Subtle Medical announced FDA clearance for SubtleSYNTHu2122, an AI-powered software that generates synthetic STIR images from existing T1 and T2 weighted contrasts, aiming to reduce MRI acquisition time to zero for this sequence. The software is complementary to SubtleMR and was validated for spinal imaging, with plans for expansion to other anatomies.
2024-07
Axis Imaging News
FDA OKs SubtleSYNTH MRI Software
Subtle Medical's SubtleSYNTH software, which uses deep learning to create synthetic STIR images from T1 and T2 contrasts, has received U.S. FDA clearance. This software, in conjunction with SubtleMR, speeds up MRI image acquisition by up to 60% and generates synthetic STIR images with zero acquisition time.
2024-07
Applied Radiology
Subtle Medical's AI-Powered Synthetic Imaging Software Gets FDA Clearance
Subtle Medical has received FDA clearance for SubtleSYNTH, a new software solution that uses deep learning to generate synthetic STIR images from already-acquired T1 and T2 weighted contrasts. This software works with SubtleMR to accelerate MRI procedures and was validated for use in the spine.
2024-07
AuntMinnie
FDA clears new software from Subtle Medical
Subtle Medical has received U.S. FDA clearance for SubtleSYNTH, an AI software that uses deep learning to generate synthetic STIR images from existing MRI T1- and T2-weighted contrasts. The software was validated for spinal use and aims to create STIR images with zero acquisition time.
2024-07
Constat
SubtleSYNTH (1.x) (K241329) u2014 FDA 510(k) evidence
SubtleSYNTH (1.x), FDA 510(k) K241329 by Subtle Medical, Inc., was cleared on July 11, 2024, under product code QIH for radiology. The clearance evidence includes four validation studies and one cited predicate.
2026-07
PR Newswire
Subtle Medical to Showcase Leading AI-powered Imaging Workflow Solutions at RSNA 2022
Subtle Medical announced it would showcase its AI-powered software solutions, including the then FDA-pending SubtleSYNTHu2122, at RSNA 2022. SubtleSYNTHu2122 uses deep learning to synthesize STIR-like contrast from T1 and T2 contrasts, with the first commercial release planned for spine imaging.
2022-11
Subtle Medical
SubtleSYNTHu2122
SubtleSYNTHu2122 is an advanced deep learning solution that generates synthetic MR imaging contrasts from existing sequences, achieving 100% acceleration and producing STIR images in zero minutes. It integrates seamlessly into radiology workflows across all MRI vendors and PACS.
unknown
Innolitics
SubtleSYNTH (1.x) | Subtle Medical, Inc. radiology AI profile
SubtleSYNTH (1.x) is a medical device best reviewed by MRI teams evaluating MRI workflow tools with FDA source traceability. It is categorized under the FDA product code QIH for automated radiological image processing software.
unknown

Videos

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Frequently Asked Questions

SubtleSYNTH (1.x) enhances MRI workflow by generating synthetic STIR images from existing T1 and T2 weighted contrasts, effectively eliminating the need for additional scan time for STIR sequences. This capability significantly reduces overall MRI scan times, improves operational efficiency, and can minimize rescans due to patient motion, ultimately benefiting patient comfort and throughput.
SubtleSYNTH (1.x) is specifically designed to generate synthetic STIR (Short Tau Inversion Recovery) images. It is currently FDA-cleared and validated for use in spine imaging, with the company planning to expand its application to brain and musculoskeletal (MSK) imaging in future releases.
Yes, SubtleSYNTH (1.x) has received FDA clearance for clinical use in the United States. This clearance confirms that the software has been reviewed and found substantially equivalent to a legally marketed device for its intended purpose of generating synthetic STIR images.
SubtleSYNTH (1.x) functions as a post-processing software that does not directly interact with the MR scanner and is not networked itself, thereby not increasing the cybersecurity risk of its users. It processes already-acquired T1 and T2 weighted images, focusing on image synthesis from existing data rather than direct handling of sensitive patient information.
A primary limitation is that SubtleSYNTH (1.x)'s current FDA clearance is specifically for spine imaging, which restricts its immediate clinical application to other anatomical regions. While there are plans for future expansion to brain and MSK imaging, physicians should consider its current scope when evaluating its utility.
Yes, other synthetic data generation tools exist in healthcare, such as SyMRI, which also generates contrasts from MRI data, though it produces multiple contrasts and is indicated for brain imaging. Conventionally, STIR images are acquired directly, which adds to scan time, making SubtleSYNTH's zero-acquisition time a distinct advantage in efficiency.
Specific pricing details for SubtleSYNTH (1.x) are not publicly disclosed in the search results. However, it is offered as part of Subtle Medical's AI solutions, often bundled into packages like Subtle-ELITEu2122. These types of enterprise software solutions are typically licensed to healthcare institutions, potentially through subscription models or based on factors like scanner volume or usage, aiming to provide a return on investment through enhanced efficiency and patient throughput.

Compare SubtleSYNTH (1.x)

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CINA-VCF vs SubtleSYNTH (1.x)
Radiology & Imaging AI Adjacent · 60/100
CINA-VCF focuses on AI-powered detection and triage of vertebral compression fractures from CT scans, aiming to improve diagnostic workflow for a specific pathology. In contrast, SubtleSYNTH utilizes AI…
VS
D2P vs SubtleSYNTH (1.x)
Radiology & Imaging AI Adjacent · 65/100
Tool A (D2P) focuses on converting 2D medical images into 3D anatomical models for advanced visualization, surgical planning, and 3D printing. In contrast, Tool B (SubtleSYNTH) is designed…
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PixelShine vs SubtleSYNTH (1.x)
Radiology & Imaging AI Adjacent · 65/100
PixelShine enhances CT scan quality by reducing noise and enabling lower radiation doses, focusing on improving existing image clarity. SubtleSYNTH, conversely, generates synthetic STIR MRI images from other…
VS
SwiftMR vs SubtleSYNTH (1.x)
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SwiftMR broadly enhances MRI efficiency by reducing scan times and improving image quality across all sequences through advanced reconstruction. SubtleSYNTH, on the other hand, specifically generates synthetic STIR…

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Suggest an Edit → | Last Verified: 2026-04-19 | First Added: 2026-04-19

Investors who backed SubtleSYNTH (1.x)

Funded through the company that built this tool.

Tsingyuan Ventures
VC T3
Los Altos, United States
$250k-$1M
Tsingyuan Ventures, accessible via foothill.ventures/tsingyuan, is the Tsinghua alumni-aligned arm of the Foothill Ventures platform, historically focused on early-stage US-China bridge investments…
AI/ML in Healthcare Biotech
Fusion Fund
VC T3
Palo Alto, United States
$500k-$5M
Fusion Fund is a Bay Area early-stage venture firm with a deep tech thesis spanning AI, healthcare, enterprise infrastructure, and frontier technology,…
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