YSTIA HAS LANDED

A new force.
Built for impact.

New technology for CT perfusion.
Every result in detail.

Explore the results

0.95Core volume CCC

0.94Hypoperfusion CCC

241 QC-passed anterior-circulation studies with DWI-confirmed lesions. See the evidence ↗

PERFUSION, IN FOCUSANONYMIZED SAMPLE

High-resolution perfusion maps showing an extensive unilateral perfusion deficit

A large MCA-territory perfusion deficit.
A detailed view of the tissue.↙

01 / THE NUMBERS

Strong agreement.
At meaningful scale.

VOLUME AGREEMENT0.95CCC

Core volume

rCBF <30% · Approx. 95% CI 0.939–0.959

VOLUME AGREEMENT0.94CCC

Hypoperfusion volume

Tmax >6 s · Approx. 95% CI 0.919–0.950

THE BROADER VALIDATION1,727

Paired studies

Within a 2,793-study campaign

The headline CCCs describe 241 QC-passed anterior-circulation studies with DWI-confirmed lesions. CCC is Lin’s concordance correlation coefficient, a measure of agreement. Agreement was evaluated against RAPID software.

See the broader results and study context

Volume agreement in the development cohort
Evaluation group	Studies	Core CCC	Hypoperfusion CCC
QC-passed anterior circulation, DWI lesion present	241	0.950	0.936
QC-passed, comparator Tmax volumes >400 mL excluded	1,554	0.928	0.932
All paired studies	1,727	0.902	0.791

Hypoperfusion values use the confident display tier. Retrospective development-cohort evaluation, September 2026. These results do not establish external clinical validation.

02 / THE BALANCE

Clarity without
losing the detail.

Better maps start with carefully selected arterial and venous input curves. Recent research guides our selection. Noise reduction comes next, with a focus on keeping smaller perfusion findings in view.

One axial view · Three processing stylesILLUSTRATIVE SIMULATION

Single axial composite Same image shown at right

The posterior lobar and smaller regions remain visible.

Move through the processingystia

Left: both regions, plus periventricular candidates. Middle: both regions remain. Right: only the posterior lobar region stays.

Composite built from recorded CT and segmentation masks. Regions are combined to illustrate filtering, not a single patient result or a product-performance test. Colors indicate simulated lesion and false-positive roles. Intermediate positions blend the images.

Why the balance matters.

Internal smoothing comparison

Smoothing changes both background findings and smaller lesion-side findings.
Study group	No smoothing	ystia study setting	Strong smoothing
Lesion-side perfusion findings5–30 mL DWI lesions · 37 studies	51%19 / 37	68%25 / 37	49%18 / 37
Nonzero perfusion findingsDWI-negative · 189 studies	96%182 / 189	47%88 / 189	21%39 / 189

Exploratory retrospective results, separate from the composite illustration above. Findings on the same side as a DWI lesion do not establish lesion overlap or clinical detection accuracy. Nonzero findings in DWI-negative studies are not necessarily false positives.

Study context

The same studies were compared at 0, 2.4 and 6 mm in-plane smoothing, with the other analysis settings held fixed. DWI is follow-up imaging, not a direct measure of the original perfusion deficit. The small-lesion group includes DWI volumes ≥5 and <30 mL; DWI-negative means <0.1 mL. Studies with thrombectomy were excluded. Eight studies in each group carried existing quality or scan-timing flags and were retained in this comparison. Other smoothing settings were also explored; these results do not establish a single optimum or external clinical validation.

03 / THE RESULTS

More than a number.
A view into every result.

Large MCA-territory involvement.
Extensive perfusion mismatch.

ANONYMIZED RESEARCH EXAMPLE / Select an image to explore it in full resolution

THE OVERVIEW

Core. Hypoperfusion. Mismatch.

The volumes that matter, alongside the images that give them meaning.

Open full resolution

Anonymized research overview with core and hypoperfusion volumes, mismatch, and axial result maps

PERFUSION MAPS

Every map. In detail.

Relative blood flow, perfusion delay and mismatch.

Anonymized high-resolution relative CBF, Tmax and threshold-defined mismatch images

Open full resolution

OXYGEN & TRANSIT MAPS

A further dimension.

Model-derived OEFmax, CMRO₂max and transit maps.

Anonymized model-derived oxygen extraction, oxygen metabolism and transit-time maps

Open full resolution

Explore threshold overlays & mismatch Open the sample at a glance

Selected for illustration, not as an estimate of average performance. Source identifiers are removed. Oxygen and metabolism maps are model-derived research estimates, not measured oxygen values.

Quantified volumes

Core and hypoperfusion volumes, mismatch volume and mismatch ratio.

High-resolution images

Summary views, threshold overlays, perfusion maps and oxygen-model maps.

Results as they arrive

Available images, processing progress and quality status in one place.

04 / THE EXPERIENCE

The whole picture.
In your pocket.

Your results travel with you. Review the numbers, open the images, and follow processing from your iPhone.

01 Key volumes at a glance
02 Full-resolution image review
03 Processing updates as results arrive

Illustrative iPhone UI with invented numbers.
The image is an anonymized research example.

Check app availability ↗Open web app ↗

Study access is limited to invited hospital members.

Anonymized perfusion sample within an illustrative phone interface — App

Live Activity · Demo

A new force.
Built for impact.