Chison ECO 6, Руководство по эксплуатации

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ECO 6 Digital Color Doppler Ultrasound System
10
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Select a low setting for each new patient. Output should only be increased during the examination if
penetration is still required to achieve a satisfactory result, and after the Gain control has been moved to its
maximum value.

Maintain the shortest examination time necessary to produce a useful diagnostic result.

Do not hold the probe in a fixed position for any longer than is necessary. The frozen frame and Cine loop
capabilities allow images to be reviewed and discussed without exposing the patient to continuous scanning.

Do not use endo-cavitary probes if there is noticeable self heating of the probe when operating in the air.
Although applicable to any probe, take particular care during trans- vaginal exams during the first eight weeks
of gestation.

Take particular care to reduce output and minimize exposure time of an embryo or fetus when the
temperature of the mother is already elevated.

Take particular care to reduce the risk of thermal hazard during diagnostic ultrasound when exposing: an
embryo less than eight weeks after gestation; or the head, brain or spine of any fetus or neonate.

Operators should continually monitor the on-screen thermal index (TI) and mechanical index (MI) values
and use control settings that keep these settings as low as possible while still achieving diagnostically useful
results. In obstetric examinations, TIS (soft tissue thermal index) should be monitored during scans carried out
in the first eight weeks after gestation, and TIB (bone thermal index) thereafter. In applications where the
probe is very close to bone (e.g. trans-cranial applications), TIC (cranial bone thermal index) should be
monitored.
MI> 0.3 there is a possibility of minor damage to neonatal lung or intestine. If such exposure is necessary,
reduce the exposure time as much as possible.
MI> 0.7 there is a risk of cavitations if an ultrasound contrast agent containing gas micro-spheres is being
used. There is a theoretical risk of cavitations without the presence of ultrasound contrast agents. The risk
increases with MI values above this threshold.
TI> 0.7 the overall exposure time of an embryo or fetus should be restricted in accordance with Table 2-2
below as a reference:
TI Maximum exposure time
(minutes)
0.7 60
1.0 30
1.5 15
2.0 4
2.5 1
Maximum recommended exposure times for an embryo or fetus
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