ORTHORALIX 9200
Service Manual
A-2
Gendex Dental Systems 4519-190-71193-7
A.1
Introduction
The Gendex Orthoralix identifies a range of stand-alone dental
systems, designed for the following radiographic purposes:
A.1.1
Panoramic radiography (PAN)
Panoramic radiography (also known as orthopantomography -
OPTG) takes X-rays of the whole dento-maxillo-facial complex,
with the following characteristics:
t
panoramic:
the entire dental and alveolar region including the
rami and the temporo-mandibular joints (TMJ), are depicted on
one radiograph.
t
orthogonal:
the trajectory of the movement is designed to
keep the projection as orthogonal as possible to the object, in
order to minimize overlapping between structures.
t
tomographic:
only a limited layer around the plane in focus is
sharply depicted, while the surrounding structures are blurred
by the tomographic movement.
The layer thickness is maximum at the sides and minimum at
the centre.
The operator can select the following projections from the con-
trol panel:
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t %FOUJUJPOPOMZ XJUIJNQSPWFECFBNPSUIPHPOBMJUZ
t 3JHIUKBX
t -FGUKBX
t .BYJMMBSZTJOVTGSPOUBMWJFX
t 3JHIUNBYJMMBSZTJOVTMBUFSBMWJFX
t -FGUNBYJMMBSZTJOVTMBUFSBMWJFX
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t 5.+MBUFSBMWJFX POUIFDFOUSBMQBSUPGUIFGJMN
t 5.+MBUFSBMWJFX POUIFFYUFSOBMQBSUPGUIFGJMN
(For the Orthoralix 9200 DDE versions only one TMJ lateral projec-
tion is available).
A.1.2
Cephalography (CEPH)
This operation mode provides X-rays of the skull at large focus
film distance (FFD), under lateral or posterior-anterior projection.
The masticatory system of the skull is shown together with details
of the soft tissue profile from chin to tip of nose.
Special devices are provided to help position the patient and to
pre-set the geometry.
A.1.3
Tomographic projections (Transcan)
a) Orthoralix 9200 Plus
Eight tomographic projections are provided, each consisting of
3 views. They include:
- RR posterior layer width 3 mm
- RR posterior layer width 6 mm
- RR incisor layer width 3 mm
- RR incisor layer width 6 mm
- LL incisor layer width 6 mm
- LL incisor layer width 3 mm
- LL posterior layer width 6 mm
- LL posterior layer width 3 mm
b) Orthoralix 9200 DDE
Four scannographic projections are provided, each consisting of
3 views having a layer width of 8 mm. They include:
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t 33BOUFSJPS
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t --BOUFSJPS
A.1.4
Phosphor Plate Extension (PPE)
A special version called Phosphor Plate Extension (PPE) is available:
this consents to use a standard 24 x 30 cm cassette (as available
for computer imaging phosphor plate in medical X-ray) instead
of the current 15 x 30 cm panoramic cassette.
A.1.5
Automatic Exposure Control (A.E.C.)
The Automatic Exposure Control (A.E.C.) is based on the use of a
feedback closed loop control on the technique factors influenc-
ing the exposure in order to automatically compensate little
differences in patient absorption and obtain the proper optical
density on the image receptor. In particular the radiation intensity
is measured by an appropriate X-ray sensor during examination
and, depending from the kind of projection, the system modu-
late the kV or modify the exposure time (only in Ceph versions
without the digital sensor) in order to obtain the proper optical
density for the film.
The purpose is to automatically compensate little differences in
patient absorption around the three predefined patient profile
(small, medium, large) and have all the same consistent film
blackening in the region of interest, while exposing the patient
to the smallest level of radiation.
(03.0)E
Printed on: 20 Apr 2012, 04:59:40 pm; Printed by: UWE.ZELLER
