ROCUS-R

Gamma-teletherapy unit

Basic specifications

• Conforms to international standards IEC 601-1, IEC 601-1-4, IEC 60601-2-11, IEC 61217.
• Distance source - axis (source - isocentre): 80 cm.
• Isocentre height above floor: 125 cm.

Gantry specifications

GANTRY (without false panel)

• Gantry consists of three parts. It's demountable disigned and delivered throught the labyrinth for installation in the therapy room.
• Rotation range: -190°/+190°.
• Rotation speed: from 0,1°/sec up to 6°/sec.
• The maximum activity of Co-60 source: 8000 Curie.
• The maximum size of the field in the isocenter: 35 cm x 35 cm

Collimation system specifications

• Asymmetric collimator's rotation angle: +/- 180°.
• Motorized wedge 60°.
• Detachable mootorized trimmers to reduce penumbra (less 1 cm).
• Removable applicator (load with blocks up to 20 kg).
• Clearances from isocentre to the surface of the collimator: 35 cm.
• Clearances from isocentre to the surface of the applicator: 18 cm.

Therapeutic table specifications

THERAPEUTIC TABLE

• Therapeutic table is isocentric, deck of the table is with removable windows.
• Rotation range of the table relative to the isocentre: -95°/+95°..
• Vertical movement range of the deck: 50 cm – 180 cm.
• Rotation range of the deck relative to the table vertical axis: -180°/+180°.

Control system specifications

• Control system is duplex, each drive of the gantry and the table is controlled by its own microprocessor. Connected to external systems (tomograph, simulator, verification system, archive, etc.) via protocol DICOM-3.

ROCUS-AM

Rotational-convergent teletherapy complex ROCUS-AM used for oncology patients’ treatment.

• automatic,semi-automatic and manual operating modes;
• static irradiation;
• dinamic irradiation with a variable or constant speed;
• program management of irradiation process;
• easy-to-use dialog-based program to manage the treatment;
• real-time monitoring;
• automatic mode and logging;
• build-in tests and hardware safety system;
• independent system ensures safety for patient and staff.

1. Basic:
   • automatic — treatment plan is imported from a file;
   • semi-automatic — plan is entered manually from the terminal station;
   • ручной — parameters of the irradiation are set by operator, time is set by the timer.
2. Additional:
   • treatment plan export to a file;
   • treatment plan print;
   • View plans located in a file.

• procedure — the shutter is opened – used for treatment ;
• simulation — the shutter is closed – no radiation emitted.

Static You specify a number of control points and doses in each point; radiation is emitted exactly from specified points.

Rotational The dose is distributed while rotating the gantry in range 0° ÷ 360° with delays in specified control points. Control points must have a distance at least 10° from each other along the axis of rotation. This method can be used only in GAMMAPLAN-1 treatment planning system.
Rotational-convergent The dose is distributed while rotating the gantry in range 0° ÷ 360° from one control point to another. The speed is selected a constant to ensure specified irradiation time. In the same time the head can move along the convergent axis.

Sector movement Sectors and corresponding doses are specified. Convergent movement is also available. Multiple sector centers can be specified.

Scan method The dose is distributed while continuous longitudinal therapy table movement. Gantry head can move in the sector along the eccentric axis.

User software provides:

• calculation of doses field distribution, absorbed in the body;
• ttreatment plan parameters optimiztion;
• printing treatment plans and dose fields.

System software provides:

• dialog-based interface;
• treatment process monitoring and unit control;
• safety during the whole treatment process;
• special treatment plans support.

I. Radiation parameters

1. Dose rate along the beam axis at a distance of 1 m from the source:
   • shutter opened – (3,9×10^-4 ± 7,8×10^-5)A/kg (1,5 ± 0,3)R/s;
   • shutter closed – no more than 20 mcS ³v/h (1,43×10^-10)A/kg (2)R/s;
2. Field reduction ratio with diaphragm shutters - no less than 500.
3. Rectangular field (50% isodose at a distance of 0,75 m from the source).
4. Field size range - from 2,0 х 2,0 mm up to 220 х 260 mm.
5. Diaphragm rotation limits ± 90 °.
6. The maximal deviation of a light field from irradiation field in isocenter plane - no more than ± 2 mm.
7. The discrepancy between centers of radiating and light fields - no more than 3 mm.
8. Shutter open/close time – no more than 7 sec.
9. Beam emission (overlapping) time– no more than 1, 64 sec.

II. Gantry parameters

1. Error of targeting of a radiating head in zero position on axises of rotation and convergence – no more than ±30 '; eccentricity – no more than ±1,5 '
2. Ranges:
   • rotation – circular, without restriction;;
   • convergences – ±28 °
   • eccentricity – ±90 °
3. Weight – no more than 5 400 kg.

III. Therapy table parameters

1. Movement limits:
   • Y (longitudinal) – from -5 up to +805 mm.
   • X (cross-section) – ±210 mm.
   • Н (vertical) – from -45 up to +345 mm.
2. Deck rotation over helding shaft – from -5 " up to +185 ";
3. Weight – 510 kg.

Basic:

• gantry;
• therapy table;
• remote control unit;
• main control unit;
• control system;
• computer with peripherials;
• laser centralizers;
• procedure room door block;
• board (Panel);
• set of assembly and spare parts, tools and accessories.

Additional:

• videocontrol device;
• communication device;
• GAMMAPLAN treatment system.

Under the separate contract JSC " Rawenstvo " provides:

• consultations on preparation of the protective accommodation, installation and operation of a complex;
• assembly and installation;
• preparation of the unit for certification;
• after-warranty service, including revision of the technical state of the complex, maintenance and repair work;
• delivery of spare parts;
• development and installation of the additional software;
• medical staff training;
• dismantling of worn-out units.

ECE (engineering complex of enterprise) developed a work package to keep complex "ROCUS-AM" up-to-date.

Work package includes:

1. onsite service for fault detection (2 persons for 10 days) and compiling a list of parts and assemblies for replacement.
2. manufacturing of parts and assemblies for major repairs and set of instruments to upgrade the unit (6 months).
3. repair and upgrading. Standard time to upgrade - 21 days, the time for major repairs is not specified, it depends on damage.

At the beginning of 2009 upgrading carried out in oncology clinics in the cities of Barnaul, Novosibirsk, Bryansk, Chelyabinsk.