Siemens ARCADIS Varic Operator's Manual page 70

System Description
Digital Radiography
Subtraction/
Roadmap (option)
24
of 44
Typical clinical procedure:
Fracture reposition of the distal upper extremity (e.g. distal forearm fracture)
in the plaster room of an emergency outpatient clinic where, under continuous
fluoroscopy, the fracture elements are reduced by extension, fixed temporari-
ly in the best possible position and then fixed permanently by applying a plas-
ter cast, with the additional advantage of dose savings for the patient and
medical staff.
Digital Radiography (DR) provides an electronic instant image of the patient on
the monitor. DR is recommended for final exposures. The exposure time de-
pends on the noise reduction set.
Exposure factors and system control units including the way in which the auto-
matic setting is controlled:
2
1 K matrix; 1 f/s frame rate, with image integration, depending on the setting;
X-ray pulse with 7 ms up to approx. 1400 ms width, depending on the noise
reduction set.
Typical clinical procedure:
Final follow-up exposure of a fracture reposition of the distal upper extremity
(see above).
The subtraction memory option allows you to perform a subtraction angiography
and simultaneously display the unsubtracted angiogram on the second monitor.
Subtraction technique allows hemodynamic display as well as display of the
maximum vascular filling and Roadmap. The Roadmapping features can also be
used for other interventional procedures.
Exposure factors and system control units including the way in which the auto-
matic setting is controlled:
2
1 K matrix; continuous fluoroscopy; storage rate usually 3 to 8 f/s; image
integration (as a function of the K factor set), i.e. number of K exposures are
integrated into one image; the K factor can be set between K = 1 and K = 32
by an authorized technician.
Operator Manual
SPR2-310.620.30.02.02