The control unit, or console, is located in a room adjacent to the main room. A leaded
glass window protects the technologist from scattered radiation and affords the technologist
a full view of the patient (Strzelczyk, 2004). On the console, the technologist selects
the technique; i.e., the KV, mA, and time for the exposure. Depending upon the age of the
unit, selections are made via rotary switches, push-button switches, paddle switches, or
up-and-down rocker switches. On some very old units, the exposure time is set with a
mechanical timer (such as an egg timer). While older units might have only an analog
meter displaying KV and mA, modern digital units have displays of KV, mA, time location
buttons (for skull, thorax, abdomen, pelvis, or extremities) that automatically set the
KV, mA, and time for the technologist. Override controls enable the technologists use
other settings as needed.
Most problems associated with the console are the same as with any control surface on
any device and include loose knobs, stuck switches, and cuts in the membranes that protect
panel switches.
The panels may display elapsed-time and dose information when in the fluoro mode,
heat units, and other information. Many of the newer units have an alarm-memory system
that logs faults in the system. This always should be viewed when any problem is
reported. Generally, alarm memories are available only when a special sequence is
entered, when the unit is in the service mode. “Technique” errors indicate that the technologist
is overriding the automatically selected settings and that he might not be getting
proper exposures. This situation could be difficult to handle because, if the technologist
is challenged, he could become more critical of the equipment.
The junction box where the wiring from the console connects to the rest of the room
can be a problem point. Coffee spills, paper clips, and heavy dust accumulation can short
connections out.
When radiologists are performing a fluoroscopic study, they are in the room with the
patient and will use either a hand or foot control to control the unit, make spot films,
and perform other adjustments. Both are failure points and need constant work. Foot
controls are subject to spills, kicks, and general abuse, while hand controls are often
dropped, thus causing severe mechanical shock from sudden stop or rapid deceleration.
One solution is to put a rubber protector on the hand control, as one would on a pulse
oximeter.
On some systems, there are up to five instrument cabinets, two high voltage tanks, and
various other components, all of which are interconnected. It is important to inspect all
exposed wiring (at least annually) and to keep the cabinets well ventilated and dust free.
The manuals should be kept in the area and secured. Some organizations keep service
records in a binder in the area, along with any field notices or updates. In radiology service,
information is power, and one must protect that source of one’s power. It is uncommon
for X-ray systems to be connected to the hospital’s emergency power system. Most
systems can be manually connected to emergency power for short periods if there is
enough generator capacity. Commonly, parts of the system are connected to power conditioners
or even an uninterruptible power supply (UPS). It is a good idea to list of how
each device in the room is powered, as some fluoroscopic video monitors could be on the
same power system as the table or control panel and will only work if those systems are
energized.
People have gone the extra mile to make X-ray systems more complicated and expensive
than they have with any other medical device. One has two to three names for the
same functions; one has interconnections for devices two feet apart that will travel 20 feet
into the floor or ceiling to a junction cabinet and then back. In addition, costs are high,
and alternate vendors for many items are not available. In imaging service, it is almost
better to be a good manager of technology than to be a good repairer of technology
The control unit, or console, is located in a room adjacent to the main room. A leadedglass window protects the technologist from scattered radiation and affords the technologista full view of the patient (Strzelczyk, 2004). On the console, the technologist selectsthe technique; i.e., the KV, mA, and time for the exposure. Depending upon the age of theunit, selections are made via rotary switches, push-button switches, paddle switches, orup-and-down rocker switches. On some very old units, the exposure time is set with amechanical timer (such as an egg timer). While older units might have only an analogmeter displaying KV and mA, modern digital units have displays of KV, mA, time locationbuttons (for skull, thorax, abdomen, pelvis, or extremities) that automatically set theKV, mA, and time for the technologist. Override controls enable the technologists useother settings as needed.Most problems associated with the console are the same as with any control surface onany device and include loose knobs, stuck switches, and cuts in the membranes that protectpanel switches.The panels may display elapsed-time and dose information when in the fluoro mode,heat units, and other information. Many of the newer units have an alarm-memory systemthat logs faults in the system. This always should be viewed when any problem isreported. Generally, alarm memories are available only when a special sequence isentered, when the unit is in the service mode. “Technique” errors indicate that the technologistis overriding the automatically selected settings and that he might not be gettingproper exposures. This situation could be difficult to handle because, if the technologistis challenged, he could become more critical of the equipment.The junction box where the wiring from the console connects to the rest of the roomcan be a problem point. Coffee spills, paper clips, and heavy dust accumulation can shortconnections out.When radiologists are performing a fluoroscopic study, they are in the room with thepatient and will use either a hand or foot control to control the unit, make spot films,and perform other adjustments. Both are failure points and need constant work. Footcontrols are subject to spills, kicks, and general abuse, while hand controls are oftendropped, thus causing severe mechanical shock from sudden stop or rapid deceleration.One solution is to put a rubber protector on the hand control, as one would on a pulseoximeter.On some systems, there are up to five instrument cabinets, two high voltage tanks, andvarious other components, all of which are interconnected. It is important to inspect allexposed wiring (at least annually) and to keep the cabinets well ventilated and dust free.The manuals should be kept in the area and secured. Some organizations keep servicerecords in a binder in the area, along with any field notices or updates. In radiology service,information is power, and one must protect that source of one’s power. It is uncommon
for X-ray systems to be connected to the hospital’s emergency power system. Most
systems can be manually connected to emergency power for short periods if there is
enough generator capacity. Commonly, parts of the system are connected to power conditioners
or even an uninterruptible power supply (UPS). It is a good idea to list of how
each device in the room is powered, as some fluoroscopic video monitors could be on the
same power system as the table or control panel and will only work if those systems are
energized.
People have gone the extra mile to make X-ray systems more complicated and expensive
than they have with any other medical device. One has two to three names for the
same functions; one has interconnections for devices two feet apart that will travel 20 feet
into the floor or ceiling to a junction cabinet and then back. In addition, costs are high,
and alternate vendors for many items are not available. In imaging service, it is almost
better to be a good manager of technology than to be a good repairer of technology
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