IEC TS 61895:1999 pdf download – Ultrasonics – Pulsed Doppler diagnostic systems – Test procedures to determine performance

IEC TS 61895:1999 pdf download – Ultrasonics – Pulsed Doppler diagnostic systems – Test procedures to determine performance.
– test methods for measuring the performance of pulsed Doppler ultrasound systems
— Doppler test objects for carrying out these tests:
and applies to
— tests made on an overall pulsed Doppler ultrasound system, a system which is not disassembled or disconnected:
– tests made on pulsed Doppler ultrasound systems whether they are stand.alone or as part of another ultrasound instrument.
Electrical safety, acoustic output and electromagnetic compatibility (EMC) are not covered in this technical specification.
The workload to perform all described tests is, in general, prohibitive. It Is intended that a subset of the described tests is adopted for regular use However, experience to give guidance br selection has still to be gathered and will be the subject ob ongoing work.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this technical specification. For dated references, subsequent amendments to. or revisions of. any of these publications do not apply. However, parties to agreements based on this technical specification are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of IEC and ISO maintain registers of currently valid International Standards.
IEC 61102:1991. Measurement and characlensat,on of ultrasonic tiaras using hydropnones In the frequency range 0,5 MHz to 15 MHz
IEC 61206:1993 Ultrasons’cs — Continuous- wave Doppler systems — Test procedures
IEC 61390:1996, Ultrasonics — Real-time pulse-echo systems — Test procedures to determine
performance specifications
3 DefinitIons
For the purposes of this technical report, Itie following definitions apply.
31
6 dB spectral width
width of a frequency spectrum between the frequencies at which the spectral power Is 6 dB
less than the maximum power
3.11
Doppler angle
acute angle between the axis of the ultrasound beam during Doppler measurements and thedirection of movement of the scatterer or reflector
3.12
Doppler demodulator
that part of the Doppler ultrasound system at which the Doppler signal is derived throughmixing of the received signal and a reference signal
3.13
Doppler frequency
Doppler-shift frequency
change in frequency of an ultrasound scattered or reflected wave caused by relative motionbetween the scatterer or reflector and the transducer. lt is the difference in frequency betweenthe transmitted and the received wave
[1.3.3 of lEC 61206, modified]
3.14
Doppler output connector
electrical connector or that part of the Doppler ultrasound system at which the Doppleroutput is available for connection to externai output devices
[1.3.5 of lEC 61206]
3.15
Doppler output
signal at the Doppler frequency or at Doppler frequencies which activates the output device[1.3.4 of lEC61206, modified]
3.16
Doppler spectrum
set of Doppler frequencies produced by a Doppler ultrasound system[1.3.6 of lEC 61206]
3.17
Doppler test object
artificial structure used in testing Doppler ultrasound systems
3.18
Doppler ultrasound system
equipment designed to transmit and receive ultrasound and to generate a Doppler output fromthe difference in frequency between the transmitted and received waves
[1.3.8 of lEC 61206]
3.19
duplex scanner
ultrasound instrument which combines real-time B-mode imaging with a Doppler ultrasoundsystem
3.20
nominal Doppler beam direction axis
assumed axis of the ultrasonic beam from the transducer used for Doppler measurements.This axis will often be the axis of rotational symmetry of the Doppler probe for a single-elementtransducer.