bk ultrasound bk3500, Руководство пользователя

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44 Chapter 3 April 2017 bk3500 User Guide (16-01410-EN-04)
NOTE:
If the image depth is set very low (to see tissue close to the transducer with
high magnification), the needle tip echo can be outside the displayed image area. To
see the needle tip in this case, zoom out so the full needle path is visible or pan the
image to the side (to keep the high magnification).
Acoustic Output
General
Medical research has yet to prove whether or not ultrasound causes biological
effects. Therefore, prudent use considerations require you to follow certain
guidelines; see EN60601-2-37
(Particular requirements for the safety of ultrasonic
medical diagnostic and monitoring equipment).
Prudent Use
•
Image patients only when clinical reasons make it necessary.
•
Keep exposure time as short as possible.
•
Be careful to prepare the patient correctly so that you get the best possible
image.
•
Start imaging at a low acoustic output level (see “Thermal and Mechanical
Indices” on page 45) and increase the level only as much as necessary to obtain
a satisfactory image.
•
If you switch from an application requiring high acoustic output levels (see
“Functions Affecting Acoustic Output” on page 48), to one that requires lower
levels (fetal imaging, for example), be sure to reset the levels before you image.
(For example, start in B-mode.)
•
Take into account all the types of tissue that may be affected. For example, when
imaging a breast, it may be appropriate to monitor the TI (Thermal Index)in
bone rather than in soft tissue because the ribs will be subjected to ultrasound.
Verify
puncture
guide type
number
WARNING P-w2
Verify that the type number of the puncture guide displayed on the monitor corresponds
to the puncture guide that you are actually using. If the number is incorrect, the puncture
line on the monitor may not correspond to the true puncture path in the tissue.
Watch the
needle tip
WARNING P-w4
The puncture line on the image is an indication of the expected needle path. To avoid
harming the patient, the needle tip echo should be monitored at all times so any deviation
from the desired path can be corrected.
Exposure
level
WARNING AO-w1
To avoid tissue damage, always keep the exposure level (the acoustic output level and the
exposure time) as low as possible.