Introduction: Electronic portal imaging devices (EPIDs) provide two- and three-dimensional planar and volumetric cone beam images to improve the accuracy of radiation treatment delivery. Periodic quality assurance (QA) of EPIDs is essential for dosimetric verification in radiotherapy. In this study, a QA program was implemented to evaluate the function of the EPID to be confident in applying co...

Srinivasan and Zhang (1993) describe behavioral evidence for two distinct movement detecting systems in bee: (1) A direction selective pathway with low frequency response characteristics serving the optomotor response and (2) A non-direction selective movement system with higher frequency response serving functions of obstacle avoidance and the ‘tunnel centering’ response where the animal seeks...

UNLABELLED Attenuation, photon scatter, and distance-dependent collimator-detector response are major degrading factors in myocardial SPECT images. The current study investigated whether compensation for these factors improves perfusion defect detectability, and compared the results for human observers with a previous study using a mathematical observer. METHODS Four methods were investigated...

Appearing as an important task in computer vision, pedestrian detection has been widely investigated in the recent years. To design a robust detector, we propose a feature descriptor called Local Response Context (LRC). This descriptor captures discriminative information regarding the surrounding of the person’s location by sampling the response map obtained by a generic sliding window detector...

The use of spatial diversity at the receiver frontend together with a sequence detector implies a joint design problem of the spatial combiner and the sequence detector impulse response. This joint design is usually faced under the constraint that the impulse response of the sequence detector is matched to the channel plus combiner response. This procedure maximizes the signal to noise ratio at...

The properties as a neutron detector of a silicon photodiode of type Hamamatsu S3590-02 in conjunction with a multi-channel analyser Alphatron-3C were investigated in an Am-Be calibration field at the department of nuclear engineering at the University of Madrid. Since the photodiode is sensitive to charged particles, we covered it with two types of converters to enable its response to thermal ...

When an intense sub-nanosecond positron pulse impinges upon a target, a pulse of g-rays is created which can yield information concerning electron–positron pairs just prior to annihilation. Many conventional g-ray detectors are unable to exploit the timing information contained within such pulses, and we describe here the development of a fast detector that is able to do so. Using a singlecryst...

found in the response of the electron-capture detector for fatty acids of niicrosomal lipids from CC1,-treated rats (the latter peak is clearly a group of unresolved peaks). Since serum very-low-density lipoproteins derive directly from the hepatic cell and since the phospholipid fraction of such lipoproteins is believed to derive from the phospholipids of the endoplasmic reticulum, we investig...