Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: geometry errors

Sortuj według:

Ogranicz wyniki do:

Daily patient geometry correction: application of NAL and eNAL protocols

Dąbrowski Andrzej, Zielińska-Dąbrowska Sylwia, Kuszewski Tomasz, Lis Krzysztof

Polish Journal of Medical Physics and Engineering

2020

Vol. 26, Iss. 4

181--184

Purpose: To test the NAL and eNAL correction protocols using daily patient setup displacements. Methods and material: In total, the analysis was performed for 749 and 797 kV CBCT images for gynecological and prostate patients, respectively, each of 30 patients. After the planning procedure, patients were set up on the treatment table in the treatment position every day. The on-line correction protocol was applied. KV CBCT images were acquired by means of x-ray lamp mounted orthogonally on Linac. Patient setup displacement was assigned. NAL and eNAL corrections protocols were simulated using daily data from online corrections for these two groups of patients. The overall systematic error and random error were calculated for each direction. Results: For the prostate group, the random errors for daily Raw data (no correction) in LAT, LONG, and VERT directions were 2.0 mm, 1.6 mm, and 3.2 mm, respectively. For NAL and eNAL protocols, they were in the range of 1.8 mm to 3.2 mm. For the gynecological group, the random errors were: for daily Raw data 2.2 mm, 1.7 mm, and 3.2 mm, respectively. For NAL and eNAL protocols, they were in the range of 2.0 to 3.4 mm. For the prostate group, values of systematic errors 1.8 mm, 1.8 mm, and 3.3 mm, respectively for Raw data. For NAL and eNAL protocols, these values were less than 1.8 mm. For the gynecological group, the systematic errors were 2.6 mm, 2.3 mm, and 2.8 mm, respectively, for Raw data. For NAL ana eNAL protocols less than 1.8 mm. For the gynecological group, for Raw data, 45% of the total displacement vectors exceeded 5 mm, whereas only 25% did after the NAL procedure and 29% after the eNAL procedure. For the prostate group, for Raw data, 34% of the total displacement vectors exceeded 5 mm, whereas only 22% did after NAL procedure and 28% after eNAL procedure Conclusions: For gynecological and prostate cancer patients, the NAL and eNAL correction protocols can be safely applied to substantially reduce setup errors.

Układ do pomiaru błędów geometrii powierzchni obrobionej podczas skrawania

Pawełko P., Jasrzębski D., Szwengier G., Dolata M.

Archiwum Technologii Maszyn i Automatyzacji

2010

Vol. 30, nr 4

111-117

W artykule przedstawiono konstrukcję oraz możliwości badawcze układu pomiarowego do doświadczalnego wyznaczenia trajektorii względnego ruchu elementów układu nośnego obrabiarki. W celu wyznaczenia błędów geometrii powierzchni obrobionej jako obiekt badań doświadczalnych wytypowano frezarkę wspornikową z prowadnicami ślizgowymi, wyposażoną w układ sterowania CNC. Badania polegały na wykonaniu serii pomiarów powierzchni próbek przed procesem skrawania, w jego trakcie i po zakończeniu. Badania błędów geometrii powierzchni próbek oraz komputerowe symulacje deformacji samych próbek - poddanych obciążeniom pochodzącym od sił grawitacji i skrawania - wykazały różnice między zadaną a rzeczywistą trajektorią ruchu zaprogramowaną w systemie sterowania NC. Dane te posłużyły do opracowania skorygowanych trajektorii ruchu, wprowadzonych do programów obróbkowych NC. Następnie przeprowadzono badania weryfikacyjne potwierdzające możliwość korygowania programów NC z uwagi na błędy geometryczne przemieszczających się względem siebie elementów korpusowych obrabiarki.

This paper presents the design and research capabilities of the measurement system for experimental designation of the relative movement trajectories of the machines carrying system. As an experimental test object for determining the processed surface geometry errors a cantilever milling tool with linear slide guide and a CNC control system was chosen. The study consisted a series of sample surface measurements before, during and after the process of machining. Measurements are performed for two depths of cut, which had previously been measured for the value of cutting forces. Measurements of the geometry errors of the test samples surface and computer simulations of the deformation of samples - exposed to gravity and cutting forces - demonstrated the difference between set and actual movement trajectory which was programmed in control system in NC. These data were used to develop a revised trajectory motion placed on the NC machining programs. Then verification tests were performed confirming capability of correcting NC programs due to geometric errors of moving machine elements