Esaote O-scan eXP, Руководство пользователя

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6 / 8 Chapter 2
RESPONSIBLE ORGANIZATION - Organizational aspects of safety are the
task of the RESPONSIBLE ORGANIZATION. This task includes adequate
training of staff, rules of access to the MR SYSTEM, qualification of staff for
decisions that are related to safety, definition of medical responsibility and
specific requirements for personnel following from that responsibility
when the PATIENT is in or near the MR SYSTEM.
In the next pages of the User Manual, the RESPONSIBLE ORGANIZATION
is indicated as USER (see definition below) because the USER tasks
includes the responsible organization’s ones.
RF - Radiofrequency.
SAFE FOR USE IN M.R. ENVIRONMENT - This indicates that a device does
not generate known risks in any M.R. environments.
The first of the two icons has a white text on a green background, while
the second has a green text on a white background with a green border;
alternatively both icons may be shown in white and black.
SAFE FOR USE IN M.R. ENVIRONMENTS IN SPECIFIC CONDITIONS - This
indicates that a device, when used in specific conditions in the M.R.
environment, does not generate additional risks.
The field conditions that constitute a specific MR environment include Field
Intensity, spatial gradient, dB/dt, radiofrequency field, and SAR.
The icon bears a black text on a yellow background with a black frame.
SAR - Acronym for Specific Absorption Rate. Indicates the RF power
absorbed by an object per mass unit (W/kg). PARTIAL BODY SAR means
that the average SAR calculated on the body mass of the patient is
exposed to the volume of the RF transmission coil for the specified time
interval.
SCOUT (SCOUT SEQUENCE) - Short pulse sequence for evaluating the
correct centering of the area being examined with respect to the magnet
isocenter. It is compulsory to acquire a Scout sequence when starting an
examination.
SCOUT IMAGES - Images of the three orthogonal slices that are placed
along the main axis of the magnet and through its center, produced by the
Scout sequence.
SIGNAL-TO-NOISE RATIO (S/N) - Ratio used as measurement of image
quality. It describes the relative contributions to the detected signal of the
true signal intensity and superimposed background noise.
SLICE THICKNESS - Is the spatial depth of each slice into which the
anatomical region to be examined is divided.
SPATIAL RESOLUTION - The system's ability to display closely spaced
points as separate and distinct. Spatial resolution depends on the voxel
size. the smaller the voxel the increased the spatial resolution.
SUPERVISING PHYSICIAN - A medical doctor who is responsible for
determining that O-scan patient examinations can be and are conducted
safely and effectively, and for interpreting the results of examinations.