Strain Measurement Using Grids

AbsztraktA gerincferdüléses gyermekek konzervatív kezelésének eszköze a korzett, mely egy kemény PE "páncél", ami a gerinc helyes állását nyomófelületeken átadott nyomóerő közvetítésével éri el. A Salus Ortopédtechnika Kft.-nél a korzettet viselő gyermekek állapotváltozásának diagnosztizálására évek óta használnak moiré berendezést. A rendszerhez kapcsolódó mérési módszer általános használatbavételéhez elengedhetetlen a hitelesítés. A hitelesítés a moiré rendszerrel meghatározott Cobb fokok és az általánosan elfogadott, kétirányú, álló helyzetben készített rönt-genfelvételeken meghatározható Cobb fokok összehasonlításával történhet. 19 páciens -9 és 17 év közötti scoliosissal és Scheuermann-betegséggel kezelt gyermek -49 moiré felvétele alapján készült a kiértékelés. Az eredmények alapján látható, hogy a módszer a gerincferdülés kö-vetésére jól alkalmazható, de röntgenfelvételeken meghatározott szögértékekhez képest a moiré felvételeken meghatározott értékek jelentősen (akár 10-15°-kal) kisebbek lehetnek, különösen a felső háti és az ágyéki görbületek esetén, ahol statisztikai úton is szignifi káns eltérés igazolódott a két módszer eredményei között. Ez okot adhat arra, hogy elgondolkodjunk az értékelési algoritmus alaposabb elemzésén és pontosításán, melyet a későbbiekben tervezünk elvégezni.Kulcsszavak: digitális moiré, moiré elv, Kamal-módszer, Kamal-metodika, moiré képek kiértékelése Evaluation of digital moiré pictures for following conditions of patients with spinal deformities AbstractChildren with spinal deformities can be effectively treated with brace. Brace is a hard polyethylene "cuirass", it can push the spine into the right position during pressure surfaces. The moiré device has been used in Salus Orthopédtechnika Kft. for ages to diagnose changes in children's conditions. Verifi cation is very important for using this measurement method. Comparison between the Cobb angles using the moiré picture evaluation method and using the accepted, two-way X-Ray images method (which were taken is standing position) can be a satisfying way for the verifi cation. 49 moiré pictures of 19 patients -treated because of scoliosis and Scheuermann disease, between the ages 9 and 17 -were the basis of the comparison. According to the results the moiré method can be applicable to follow patients' conditions, but there are differences in the Cobb angles (even 10-15°) between the two methods. Evaluation of the moiré pictures gives us smaller angles, than evaluation of X-Rays, mostly in case of dominant upper dorsal, or lumbar abnormal curvatures. There is also statistical difference between the two groups. According to this result it is inevitable to consider the analysis and clarifi cation of the algorithm in the near future.

Section: Eredeti Közleményekunclassified

Evaluation of digital moiré pictures for following conditions of patients with spinal deformities

Balla¹,

Prommer²,

Antal³

2014

“…Optical measurement methods of three-dimensional surface metrology became rapid and effective tools especially in the field of orthopedics, [1][2][3][4][5]7,[17][18][19] where moiré imaging (used mostly in spinal deformities) is considered to be capable of measuring and graphically displaying whole surfaces instantaneously. 23 By the superimposition of two similar periodic structures translated, or rotated relative to each other, a new structure arises with longer periods.…”

Section: The Moiré Effectmentioning

confidence: 99%

Processing of digital moiré images in Salus Ortopédtechnika Kft.

Balla¹,

Marlok²,

Prommer³

et al. 2013

More and more children and youngsters are affected by spinal deformities these days. These diseases can be well cured if they are detected and filtered out in time. We wanted to set up an objective and safe method with which we can diagnose wide spectrum of school-aged youngsters without harmful side-effects. Creating moiré images was one way to solve this problem, that is the reason why we started to test this method in filtering and following the condition of our young patients. Patients measured by us were going through a general examination method where their phisical status was examined by physiotherapists, and relief images were taken of their back.The initial aim to make the moiré image use an objective method to filter and follow the patient's condition in case of weed curvature of the spine could not be totally fulfilled. The reason is that the evaluation of the images is still a subjective method done by our vision. A possible solution could be to find an objective evaluation method where we can process, evaluate and compare the images with the same conditions. The programming and use of a proper image processing algorithm could be a great help for us.

“…The advantage is the simultaneity and touch-freeness, so the measured body is not charged with measuring pressure at all, information can be obtained all of its points at the same time. Its measurement applicability is wide [1][2][3][4][5] . This technique can also be used to measure deformation caused by pressure or by temperature change, when measurement with mechanical process cannot be carried out.…”

Section: Magyar Biomechanikai Konferencia -A-0062mentioning

confidence: 99%

Scoliosis testing features on the basis of electronically generated moire patterns

Gaál¹,

Antal²,

Péter³

2010

The Dept. of Mechatronics, Optics and Information Engineering, within the project team, had built an electronic moire equipment to visualize and diagnose scoliosis. The device generates a computerized moire phenomenon, which can be viewed and save for later examination. The applicability of the system was tested with statistical method from the moire patterns, which was created by the prototype device. The results of the calculations -to determine the rate of scoliosis by moire patterns -are promising and comparable with X-ray examinations.