Current dosimetry protocols require geometrical reference conditions for the determination of absorbed dose in external radiotherapy. Whenever these geometrical conditions cannot be maintained the application of additional corrections becomes necessary, in principle. The current DIN6800-2 protocol includes a corresponding factor k(NR), but numerical values are lacking and no definite informatio...

We have developed an industrial CT and Digital Radiography system (CT/DR) for NDT at the USC (Spain). A 510 mm long detector array of 640 detection elements with sub-millimetre spacing (0.8 mm), together with a 50kV mini-focus tube have been integrated in a 3-axis positioning system of flexible configuration. Accurate characterization of geometrical parameters and system commissioning has been ...

Still today, industrial robot tasks involving contact (compliant motion tasks) are often position-controlled and, hence, require very structured environments. This means that the robot’s tools and work pieces are accurately positioned and their dimensions are known. The aim of the presented research is to increase the robot’s autonomy by measuring its position and the contact forces during the ...

We investigate a relativistic positioning system where the coordinates of users are determined by proper times broadcasted clocks in motion spacetime: these so-called emission coordinates. In particular, we focus on flat this case, show that can be defined using an approach based simple geometrical properties geodesic triangles. analyze 2-dimensional case and then how whole procedure applied to...

background and aims: to obtain maximum advantages from orthodontic fixed appliances and to achieve the desired final occlusion, correct bracket positioning is highly necessary. in order to measure and determine bracket’s height, diverse gauges have been used. the objective of the present study is to determine and compare bracket positioning accuracy by using height bracket positioning gauge (hb...

Purpose  Radiotherapy treatment planning of extended volume typically necessitates the utilization of multiple field isocenters and abutting dosimetrically matched fields in order to enable coverage beyond the field size limits. A common example includes total lymphoid irradiation (TLI) treatments, which are conventionally planned using dosimetric matching of the mantle, para-aortic/spleen, and...

In t h i s paper , we descr ibe an e f f i c i e n t a l g o r i t h m fo r 3-0 scene a n a l > s i s . This a l g o r i t h m uses a segmentat ion of the sur faces to i d e n t i f i e d i n t o geomet r i ca l p r i m i t t be i ves , the o r i g i n a l data being obta ined by a laser range f i n d e r . Moreover, the a l g o r i t h m es t imates p r e c i s e l > the l o c a t i o n and o ...

background and purpose: this study was designed to investigate of simulation based education in achieves skills proficiency in medical radiation technologist students. methods: the students randomly were divided in two groups, a (n=25) and b (n=22) that received a routine course and simulation based education respectively. the chain of experiments was concerned to evaluate of skills proficiency...