[en] In this work is estimated variance kerma function pixel values for the real response curve nonlinear digital image system, without resorting to any approximation to the behavior of the detector. This result is compared with that obtained for the linearized version of the response curve.

[en] Computed tomography (CT) is the imaging modality that contributes most to the growth of exposure to ionizing radiation from medical imaging, representing 12% of imaging procedures using ionizing radiation, but helps with 46% of the collective dose to the population. The objective of this study is to demonstrate the usefulness of the software DoseWatch for the study and optimization of the dose in scans of TCHMC. (Author)

[en] To compare the State of current of the Brainscan planner with the initial reference State has been successful. This new detector shows behavior similar to its predecessor (Gafchromic EBT2), but without the disadvantages arising from the construction of the same. (Author)

[en] As part of a project for animal research, replaced electronics one of the gamma-cameras (GC) of the service that was out of use, with the aim of using it for SPECT. The implementation is therefore required of the corrections that allow image quality enough for SPECT from raw data supplied by the team. This has been developed software that enables to perform correction of power, uniform and linearity on the acquired data. For validation, change in several parameters indicative of the image quality has been evaluated. (Author)

[en] This paper presents a comparative study of the detector arrays developed by different business houses to the demand for devices that speed up the verification process. Will analyze the effect of spatial response of individual detectors in the measurement of dose distributions, modeling the same and analyzing the ability of the arrays to detect variations in a treatment yield.

[en] One of the suggestions in the new Protocol (February 2010) of the European Association of Nuclear Medicine ^Routine quality control recommendations for nuclear medicine instrumentation is to record the value cps / MBq obtained in carrying out this test to track sensitivity thus obtained. Ideally, this sensitivity should remain constant over time. At our institution this parameter has been registered since February 2009. In this paper we analyze data collected through December 2010 (23 months), relating the apparent loss of sensitivity downtime losses.

[en] The adequacy of the couple formed by the GAFCHROMIC XR-R film and the MICROTEK Scan Maker 8700 for skin dose determination has been evaluated. The main advantages are the ease of use the films, since it can be manipulated without special care and the ability to archive it in the dosimetric history of the patient. The main limiting factors coming from the scanner are the reproducibility over time and noise in the digitization; it is shown that this last component can be minimized at the cost of resolution. From the film itself, the limiting factors are the inter and intra film uniformity. Contributing an 6,5% to the overall uncertainty in dose determination. Overall, it has been shown that skin dose determination is possible with this film with an uncertainty below 10%. (Author)

[en] Mammographic studies are now one of the most demanding radiological because of its effectiveness in detecting breast cancer early. The introduction of digital mammography has been a major advance because it has overcome some of the limitations of conventional systems. Due to the nature of the radiosensitive glandular tissue becomes very important control of the dose given to patients. In the present study is to analyze the variations in dosimetry that can exist between a conventional mammography and digital mammography.

[en] The objective of this work is to make a comparison of the doses in the 10 protocols most commonly used in our Center, before and after the commissioning of the software ASIR (Adaptive statistical iterative reconstruction). (Author)