Feasibility of Ultrasonic Flow Measurements via Non-Linear Wave Propagation

Typically, ultrasonic flow meters assume linear wave propagation. Nevertheless, if the transducers of an ultrasonic flow sensor excite a pressure wave with a high amplitude, nonlinear wave propagation effects become significant. The appearance of higher harmonics increases the bandwidth of the received signal, which may potentially lead to a...

Minimizing the Zero-Flow Error in Transit-Time Ultrasonic Flow Meters

Transit-time ultrasonic flow meters are based on the fundamental idea that the flow is the only non-reciprocal effect between an upstream and downstream measurement. Non-identical transducers can be used in a reciprocal manner if the circuit is made reciprocal. In this paper we analyze the effect of driver- and readout electronics on the zero...

Clamp-on Ultrasonic Flow-metering via Matrix Trandsducers

Preparing for the next public debate: Universal vaccination against hepatitis B

WHO have long called for universal vaccination against hepatitis B worldwide. However, in north-western Europe low incidence of the disease has fueled debate whether targeted or universal vaccination strategies are the way to go for. Careful assessment has made it clear that the extensive targeted hepatitis B vaccination programmes in the...

Optimization of a phased-array transducer for multiple harmonic imaging in medical applications: Frequency and topology

Abstract—Second-harmonic imaging is currently one of the standards in commercial echographic systems for diagnosis, because of its high spatial resolution and low sensitivity to clutter and near-field artifacts. The use of nonlinear phenomena mirrors is a great set of solutions to improve echographic image resolution. To further enhance the...

De zachte lokroep van de focuskliniek - Buitenlandse voorbeelden lijken aanbeveling voor Nederland

Het algemene ziekenhuis is niet meer van deze tijd, nieuwe vormen van ziekenhuiszorg dienen zich aan. De focuskliniek bijvoorbeeld, een voorzicht wenkend perspectief.

Parental opinions about the expansion of the neonatal screening programme

Background: Advances in genomics will open up opportunities in the fields of genetic testing, early diagnosis and disease treatment. While neonatal screening is the field of application par excellencefor these developments, the debate on its potential benefits and drawbacks is mainly theoretically driven and based on the opinions of...

Information and informed consent for neonatal screening: Opinions and preferences of parents

Background: The current neonatal screening program ("the heel prick") involves taking a few drops of blood from almost every newborn in the Netherlands to determine whether the child is suffering from one of three congenital disorders: phenylketonuria, congenital hypothyroid, or adrenogenital syndrome. This study investigated the preferences and...