Circle Cardiovascular Imaging vs Siemens Healthineers AI-Rad Companion
Coronary calcium on CT is where the two overlap. Siemens lists coronary calcium and heart volume under AI-Rad Companion Chest CT, next to lung nodule detection, aorta measurements and pulmonary density. The modules are Chest CT, Chest X-ray, Brain MR, Prostate MR and Organs RT, deployed through teamplay with DICOM SR and PACS delivery. A lung screening program that wants nodule detection delivered to PACS fits Siemens. A 2021 BMC Medicine study of 117 low-dose CT patients reported a coronary calcium kappa of 0.846, with per-patient nodule sensitivity of 1 and specificity of 0.708. The Chest X-ray module carries a vendor footnote that it is not for sale in the U.S.
Circle describes AI Plaque Analysis as AI-powered coronary plaque quantification with detailed reporting, and its partner-integrations page names Siemens Healthineers. For a cardiology service that wants coronary plaque quantification, AI-Rad Companion loses: Siemens' Chest CT page lists coronary calcium and heart volume, while Circle holds K251027 for the cvi42 Coronary Plaque Software Application, decided October 27, 2025.
Radiology · Reviewed November 2, 2026
Circle Cardiovascular Imaging
by Circle Cardiovascular Imaging Inc. · founded 2007
cvi42 cardiac MR and CT software with FDA-cleared AI coronary plaque analysis and StrokeSENS acute stroke tools.
Siemens Healthineers AI-Rad Companion
by Siemens Healthineers
AI-Rad Companion: Chest CT, Chest X-ray, Brain MR, Prostate MR and Organs RT (radiotherapy contouring) modules, delivered through teamplay.
When to pick each one
Circle Cardiovascular Imaging
- AI Plaque Analysis module for coronary plaque
- Integrated solutions with Siemens Healthineers
- ISO 13485 and MDSAP certificates from BSI
Siemens Healthineers AI-Rad Companion
- Chest CT nodules, calcium and heart volume
- Delivered through teamplay with DICOM SR and PACS
- Cardiovascular module K183268, updated as K222360
Score
Each row shows points earned of points available under the published rubric.
Circle Cardiovascular Imaging
42of 100
Siemens Healthineers AI-Rad Companion
39of 100
| Dimension | Circle Cardiovascular Imaging | Siemens Healthineers AI-Rad Companion | Difference |
|---|---|---|---|
| FDA clearance | 18 / 18 | 18 / 18 | 0 |
| HIPAA / SOC2 / BAA | 0 / 10 | 0 / 10 | 0 |
| EHR integrations (count) | 0 / 4.2 | 0 / 4.2 | 0 |
| Top-3 EHR coverage (Epic / Oracle / Athena) | 0 / 2.4 | 0 / 2.4 | 0 |
| Peer-reviewed papers | 0 / 18.2 | 0 / 18.2 | 0 |
| RCT / meta-analysis / systematic review | 0 / 7.8 | 0 / 7.8 | 0 |
| Funding & adoption signal | 8.4 / 12 | 12 / 12 | -3.6 |
| Pricing transparency | 2.5 / 5 | 2.5 / 5 | 0 |
| Years in market | 6 / 6 | 0 / 6 | +6 |
Scroll horizontally to see every column.
Pricing
Circle Cardiovascular Imaging
| Tier | Monthly | Annual | Notes |
|---|---|---|---|
| Enterprise | n/a | n/a | No public price. |
Siemens Healthineers AI-Rad Companion
| Tier | Monthly | Annual | Notes |
|---|---|---|---|
| Enterprise | n/a | n/a | No public price on the vendor page. |
Evidence
Circle Cardiovascular Imaging
FDA decisions
K251027 (opens in new tab)510(k)2025-10-27
cvi42 Coronary Plaque Software Application
K250221 (opens in new tab)510(k)2025-07-01
StrokeSENS ASPECTS Software Application
K242781 (opens in new tab)510(k)2024-10-15
cvi42 Software Application
K241038 (opens in new tab)510(k)2024-06-07
Cardiac CT Function Software Application
K232661 (opens in new tab)510(k)2023-12-07
Myocardial Strain Software Application
Show 7 more
K222593 (opens in new tab)510(k)2023-01-18
TruPlan Computed Tomography Imaging Software
K213998 (opens in new tab)510(k)2022-07-28
cvi42 Auto Imaging Software Application
K212261 (opens in new tab)510(k)2021-10-14
StrokeSENS LVO
K202212 (opens in new tab)510(k)2021-02-19
TruPlan
K141480 (opens in new tab)510(k)2014-08-22
CVI42
K111373 (opens in new tab)510(k)2011-08-23
CT42 Cardiac CT Software
K082628 (opens in new tab)510(k)2008-11-20
CMR42 Cardiac MRI Imaging System
Siemens Healthineers AI-Rad Companion
FDA decisions
K252548 (opens in new tab)510(k)2026-04-10
AI-Rad Companion Organs RT, update
K252608 (opens in new tab)510(k)2025-09-09
AI-Rad Companion Prostate MR, update
K242745 (opens in new tab)510(k)2025-03-27
AI-Rad Companion Organs RT, update
K232899 (opens in new tab)510(k)2024-04-03
AI-Rad Companion Organs RT, update
K222360 (opens in new tab)510(k)2023-04-06
AI-Rad Companion (Cardiovascular), update
Show 8 more
K222361 (opens in new tab)510(k)2022-10-20
AI-Rad Companion (Musculoskeletal)
K213706 (opens in new tab)510(k)2022-04-15
AI-Rad Companion Brain MR, update
K193562 (opens in new tab)510(k)2020-11-06
AI-Rad Companion Organs RT
K193283 (opens in new tab)510(k)2020-07-30
AI-Rad Companion Prostate MR
K193290 (opens in new tab)510(k)2020-06-17
AI-Rad Companion Brain MR
K183268 (opens in new tab)510(k)2019-09-10
AI-Rad Companion (Cardiovascular)
K183271 (opens in new tab)510(k)2019-07-26
AI-Rad Companion (Pulmonary)
K183272 (opens in new tab)510(k)2019-02-01
AI Rad Companion (Engine)
Compliance and integrations
Documented from each vendor’s own pages.
| Spec | Circle Cardiovascular Imaging | Siemens Healthineers AI-Rad Companion |
|---|---|---|
| Free tier | ||
| HIPAA | ||
| SOC 2 Type II | ||
| EHR integrations | Not specified | Not specified |
| Founded | 2007 | n/a |
| HQ | CA | DE |
Scroll horizontally to see both columns.
Common questions
Open the full radiology comparison
Acute-care triage, mammography screening, CCTA plaque analysis, mobile MRI. 30+ FDA-cleared platforms across stroke, oncology, cardiac. Enterprise sales only — we compared what's deployed where.