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PLANMECA'S R&D DEPARTMENT CONDUCTED TESTS THAT EVALUATED THE EFFECT A SHAKING
PHANTOM HAD ON IMAGE QUALITY WITH AND WITHOUT ARTEFACT CORRECTION.

Image 1. The original reconstruction Image 2. A reconstruction with Image 3. A reconstruction with both
captured at a very low dose the Planmeca AINO™ 3D noise filter Planmeca CALM™ and Planmeca AINO™
algorithm applied applied

Our Planmeca CALM™ algorithm for correcting patient movement in “In the past, dentists would send
CBCT images is taking dentistry by storm. As the first end-user solution for their unsatisfactory images to the
motion artefact correction from a dental manufacturer, the feature has manufacturer or just redo the entire
already been praised by dentists out in the field. Planmeca’s 3D Imaging scan, but with Planmeca CALM this is now
Specialist Mikko Lilja recounts how the ground-breaking algorithm came a thing of the past. We are proud to be
to be and why he believes every dentist can benefit from it. the first dental manufacturer to provide a
solution for motion artefact correction to
the end-user”, Lilja says.

COPY ALEKSANDRA NYHOLM UNIQUE END-USER SOLUTION HIGH EXPERTISE MEETS
IMAGE PÄIVI TELENIUS Patient movement is among the most HIGH TECHNOLOGY
significant challenges to CBCT image According to Lilja, an end-user solution
IT all happened very naturally”, quality. When a patient moves during for patient movement correction
says Mikko Lilja as he describes the imaging, it produces artefacts that had been on Planmeca’s algorithm
background to developing Planmeca affect the quality of the image. development roadmap for some time,
CALM™, the trailblazing iterative and was assigned to him upon joining the
algorithm for correcting patient “In tomographic reconstruction, Planmeca 3D imaging team.
movement. the assumption is that the measure-
ments – in this case the CBCT X-ray “I think the timing was perfect for
“I had gained a good understanding projection images – are geometrically everybody. With Planmeca’s expertise in
of movement as an imaging problem consistent with one another”, Lilja medical imaging and image reconstruc-
in my doctoral research work. When explains, “but when a patient moves, tion and my knowledge of movement
it then turned out this was also a topic the data no longer adds up, which correction, we just
of interest for Planmeca, it all came shows in the reconstruction. immediately put our heads together and
together.” got to work."
“What Planmeca CALM does
The name CALM stands for is it restores the consistency of The development process was not
Correction Algorithm for Latent the X-ray measurements by tracking without its challenges, and a lot of effort
Movement and describes a projection the movement of the patient, resulting went into creating a dedicated algorithm
geometry optimisation algorithm in a sharper final image.” for Planmeca CBCT devices.
which can analyse and compensate
for patient movement in CBCT images. Planmeca CALM works with all “My previous experience was related
The outcome is an improved image volume and voxel sizes and adds to industrial tomography imaging, where
which eliminates the need for retakes only under 30 seconds to the overall things like reconstruction times and the
– saving time and improving patient reconstruction time. The feature can imaged target itself were very different.
safety. be applied after the scan is complete, So although our first prototype tests were
but also before exposure to ensure encouraging, we had to go back to the
that the volumes are already corrected drawing board time and again to produce
when they are accessed in the a new algorithm for dental imaging”, Lilja
Planmeca Romexis® software. recounts.

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