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Comparison of different metrological devices used in biomedical applications

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2010 J. Phys.: Conf. Ser. 238 012058
(http://iopscience.iop.org/1742-6596/238/1/012058)
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13th IMEKO TC1-TC7 Joint Symposium
Journal of Physics: Conference Series 238 (2010) 012058

IOP Publishing
doi:10.1088/1742-6596/238/1/012058

C ompar ison of differ ent metr ological d evices used in
biomedical applications
R yniewicz Andr zej , Ga ska Adam
Laboratory of Coordinate Metrology, Department of Mechanical Engineering, Cracow
University of Technology, al. Jana Pawla II 37, 31-864 Cracow, Poland
andrzej@ryniewicz.pl, agaska@mech.pk.edu.pl
Abstr act. Thanks to the progress in examination of human body, it is possible to create new
methods of diagnostics. To diagnose diseasesproperly, one should recognize the internal and
external structure of organs, their geometrical parameters, width, height, etc. And this is a
place, in which cooperation between coordinate metrology and medicine is the most strong.
Metrological devices could be used in this area, in a variety of uses. Paper shows usage of
Coordinate Measuring Machines (CMM) and Coordinate Measuring Arms (CMA) indetermination of external structure, dimensions and shape of measured objects (part of bones
and joints). Also use of Computed Tomographs (CT) in medical applications will be presented.
Then the comparison of results of measurements performed on each device will be made. Apart
from this, article puts attention on practical meaning of results obtained from CT
measurements. Problem of the shapemapping and its accuracy will also be discussed.

1. Intr oduction
Metrology is a science, which solves problems concerning measurements from almost all kinds of
sciences: technological, environmental or medical. Nowadays, there are still more and more uses of
coordinate metrology in biomedicine and connected with it measurements of live beings organs
geometry. This is why there is a need tofocus on opportunities which biomedical metrology gives.
Thanks to the progress in examination of human body, it is possible to create new methods of
diagnostics. To diagnose diseases properly, one should recognize the internal and external structure of
organs, their geometrical parameters, width, height, etc. And this is a place, in which cooperation
between coordinate metrology and medicineis the most strong. Metrological devices could be used in
this area, in a variety of uses. Thanks to Coordinate Measuring Machines (CMM) and Coordinate
Measuring Arms (CMA) it is possible to determine external structure, dimensions and shape of
measured object (for example part of bone or joint). When it is impossible or not advised to measure
objects with use of touch probes they could alsoperform measurements in optical way, without
physical contact with it. On the other side, Computer Tomographs (CT) despite of external surface of
organs could perform measurements of its internal structure.
In this article the description and methodology of use of mentioned devices, in medical applications
will be presented. Usage of them will be presented on example of real medicalmeasurements. Also the
comparison of results of measurements performed on each device will be made. Apart from this,
article puts attention on practical meaning of results obtained from CT measurements. Problem of the
shape mapping and its accuracy will also be discussed.

c 2010 Published under licence by IOP Publishing Ltd

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13th IMEKO TC1-TC7 Joint Symposium
Journal of Physics: Conference...