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The Akucal Resource Center
18 years of experience in one place. Everything you need to scale accurately, template confidently, and plan precisely.
J2 Medical has been the leading voice in radiographic calibration since 2007. We built the Akucal. We also built the reference sites that surgeons, reps, radiologists, and software companies rely on to understand x-ray scaling and orthopedic templating.
Everything below is practical, clinical, and free to use.
Free Clinical Tools
Title: X-Ray Magnification Calculator
Description:
Enter your actual marker size and your measured marker size from the image. The calculator instantly returns your magnification factor and magnification percentage — no software required.
Use it when: You need to verify magnification before templating, or when working without digital templating software.
→ Open Calculator
Title: Akucal Placement Guide
Description:
A step-by-step visual reference for correct Akucal positioning across anatomy types — hip, knee, and full-length. Proper placement at anatomy level is the single most important factor in templating accuracy.
Peer-reviewed research confirms: a 3.5 cm error in marker placement can produce a full cup size error in total hip arthroplasty templating.
(Ramme AJ et al., HSS Journal 2018 — PubMed ID: 29398996)
Independent Reference Sites Built by J2 Medical
Independent Reference Sites Built by J2 Medical
We built two vendor-neutral educational resources for the orthopedic imaging community. They cover the science and workflow in depth — so this site can focus on what it does best: the Akucal.
Title: X-Ray Scaling Facts
Subtitle: xraymagnification.com
What it covers:
The physics of x-ray magnification, how to calculate it, why calibration marker placement determines accuracy, DICOM scaling requirements, and a complete evidence base with peer-reviewed references.
Best for: Radiologists, x-ray technologists, PACS administrators, ortho reps, and templating software teams who need a technical deep-dive.
Key sections:
· Magnification 101
· Measurement vs. Calibration
· Calibration Methods
· Evidence & References
· PACS / Viewer Requirements
→ Visit xraymagnification.com
Title: Orthopedic Templating Software — A Practical Guide
Subtitle: orthopedictemplating.com
What it covers:
How digital templating works, why it replaced analog acetate overlays, the surgical planning workflow from imaging to OR, implant library management, and the critical role of magnification calibration in planning accuracy.
Best for: Orthopedic surgeons, surgical residents, surgical planners, and implant representatives who want to understand the full templating workflow.
Key sections:
· How Templating Works
· Workflow & Best Practices
· Scaling & Magnification
· Platform Overview
· Glossary
→ Visit orthopedictemplating.com
Xrayscaling.com
All things x-ray scaling such as mag marker, ortho scaling, xray tool and a mag calculator
Akucal.com
The flagship Akucal product has it’s own page featuring some new videos.
The Clinical Evidence
The importance of correct calibration marker placement isn't opinion — it's documented in peer-reviewed orthopedic literature. Here is the key study referenced across our resources.
STUDY: Scaling Marker Position Determines the Accuracy of Digital Templating for Total Hip Arthroplasty
Authors: Ramme AJ, Fisher ND, Egol J, Chang G, Vigdorchik JM
Published: HSS Journal, February 2018 (Vol. 14, Issue 1, pp. 55–59)
DOI: 10.1007/s11420-017-9578-0
PubMed ID: 29398996
Key Findings:
· Placing the scaling marker at the level of the acetabular implant center produces an accurate template
· A difference of 3.5 cm in marker placement produced a full cup size magnification error
· Positioning the marker at the pubic symphysis resulted in a four cup size error
· Conclusion: Digital templating accuracy depends entirely on correct scaling marker placement
→ Read the full study on PubMed
Resources by Role
Different members of the orthopedic team have different needs. Here's where to start based on your role.
Role 1 — Orthopedic Surgeon / Surgical Planner
You need: Accurate implant sizing from templating software.
The critical step: Correct calibration marker placement at anatomy level before imaging.
Start here:
· Orthopedic Templating Reference → orthopedictemplating.com
· Free 30-Day Akucal Trial
Role 2 — Radiology Technologist / X-Ray Tech
You need: A reliable, easy-to-position calibration marker that works in any imaging setup.
The critical step: Placing the Akucal at anatomy level — not on the table surface.
Start here:
· X-Ray Scaling Reference → xraymagnification.com
Role 3 — Orthopedic / Implant Sales Rep
You need: To understand calibration and help clinical teams get templating right before cases.
The critical step: Making sure every facility you work with has a proper calibration marker and knows how to use it.
Start here:
· Calibration Methods Reference → xraymagnification.com
Role 4 — Hospital / Facility Purchasing
You need: A compliant, durable, easy-to-sanitize calibration solution for multiple imaging suites.
The critical step: Equipping every imaging room, not just one.
Start here:
· Multi-Room Packages (PowerPAK, HeftyPAK, FatPAK)
· Free Trial for Your Facility
QUICK REFERENCE: MAGNIFICATION FACTS
Key Facts Every Imaging Team Should Know
Fact 1:
X-ray magnification is always present.
Every radiograph is enlarged relative to true anatomy. The degree varies with every patient, every setup, and every technologist. It cannot be assumed or estimated — it must be measured.
Fact 2:
The 25mm sphere is the clinical standard.
A 25mm calibration marker is the most widely used reference size in orthopedic templating worldwide. It is the default size for the Akucal™ and is supported by all major templating platforms.
Fact 3:
Placement plane determines accuracy.
The calibration marker must be positioned at the same depth as the anatomy of interest — not on the table surface, not on the patient's skin. Depth error produces scale factor error.
Fact 4:
Software does not fix a bad scale factor.
Even the most sophisticated templating software cannot correct for a miscalibrated image. Garbage in, garbage out — the software measures the image, not the patient.
Fact 5:
One wrong implant size costs more than an entire Akucal fleet.
Revision surgery for implant mismatch can cost tens of thousands of dollars. The Akucal pays for itself on the first correctly sized case.CTA
Ready to Eliminate Magnification Error?
The Akucal™ has been the world's #1 x-ray scaling tool since 2007. Used in 8,000+ facilities. Trusted by orthopedic surgeons on every continent. Compatible with all templating software.