specifications Clinac iX Accelerator Innovative platform for today, solid foundation for the futureSpecificationsIntroductionThis specication sheet provides information for the ClinaciX linear accelerators. 1.0Photon Beams1.1Energy: Up to three photon beams may beselected in accordance with the specications andcombinations listed in Table 1.The base Clinac iX conguration features a single photonenergy.page 2Vari anCl i naci X speci fi cati ons1Depth of ionization applies to 10 x 10 cm2field sizemeasured at 100 cm Target-Skin Distance (TSD).2Flatness is defined as the maximum variation from themean dose delivered within the central 80% Full WidthHalf Maximum (FWHM) region measured at 100 cm TSD ata depth of 10 cm. The mean is the average of the maximumand minimum points within the central 80% FWHMregion. The specification of 2.5% applies to both the radialand transverse axes of all square field sizes from 20 x 20cm2to 40 x 40 cm2, inclusive. A specification of 3.0%applies to all square field sizes between 10 x 10 cm2and 20x 20 cm2, and to 20 MV for all square field sizes larger than30 x 30 cm2. For the SRS 6MV beam, a specification of3.0% applies to all square field sizes between 10 x 10 cm2and 15 x 15 cm2.3Symmetry is defined as the maximum difference betweenthe X-ray dose delivered to any two points which areequidistant and symmetrical about the central axis andwithin the central 80% FWHM region measured at 100 cmTSD at a depth of 10 cm. This specification applies to theradial and transverse axes of all square field sizes from 10 x10 cm2to 40 x 40 cm2. For the SRS 6 MV beam, thisspecification applies to the radial and transverse axes of allsquare field sizes from 10 x 10 cm2to 15 x 15 cm2.4Beam matching between 6 MV Beam I and the optionalSRS 6 MV beam is provided and defined as follows:4.1The depth of Dmaxalong the central axis in a waterphantom at 100 cm TSD is within 1.5 mm of theaverage of the two beams. The relative dose at 10 cmdepth on the central axis in a water phantom at 100 cmTSD is within 0.5% of the average of the two beams.4.2The dose at any point within the central 80% of thefield along the major axes, normalized to the centralaxis, is within 1 percentage point of the average of thetwo beams. This specification applies to beams at 10 cmdepth and field dimensions of 10 x 10 cm2and above.Table 1: X-ray Beam PerformanceX-ray Beam Energy Combinations (MV)Beam IOptional Beam II Optional SRS Beam(BJR 17/BJR 11)4 10/10 N.A.610/10 66 16/15 66 23/18 6625/20 68 16/15 N.A.8 23/18 N.A.Nominal Nominal %DepthEnergy (MV) Energy (MV) DmaxDose atBJR 17BJR 11 (cm)110 cm Depth1Flatness2Symmetry34 4 1.20 0.20 63.0 1.03.0%2.0% SRS6 4SRS6 41.60 0.1567.0 1.03.0%2.0% 661.60 0.1567.0 1.02.5%2.0% 8 82.00 0.15 71.0 1.02.5%2.0%10102.40 0.1574.0 1.02.5%2.0% 16152.90 0.1577.0 1.02.5% 2.0%23183.30 0.1580.0 1.02.5%2.0% 25203.50 0.1581.5 1.02.5%2.0%1.2Dose Rate: For Beam I and optional Beam II, thedose rate can be selected in xed steps of 100 MU/min up to a maximum dose rate of 300, 400, or600 MU/min. For the optional SRS 6 MV Beam,the dose rate is 800 MU/min (1000 MU/min,Trilogy conguration only). The optional SRS highdose rate supports efcient delivery of stereotacticradiosurgery, stereotactic radiotherapy, andintensity-modulated radiation therapy (IMRT).Refer to section 12.0 for further information. Anoptional low dose rate mode is also available.Refer to section 13.0 for further information.1.3Maximum Field Intensity at Dmax: Theintensity at the depth of maximum buildup(Dmax) does not exceed 109% of the centralaxis intensity anywhere in the measurementplane of any field size.1.4Leakage: The X-ray absorbed dose does notexceed 0.1% of the absorbed dose at theisocenter measured anywhere in the patientplane outside of the maximum useful beam.The neutron dose equivalent (Sievert) does notexceed 0.2% of the X-ray absorbed dose(Gray) at the isocenter.The patient plane is defined as a circular planewith a radius of 2 m, centered on andperpendicular to the axis of the beam atisocenter. The X-ray measurements may beaveraged over an area not to exceed 100 cm2.In all other directions, the X-ray absorbed dose1 m from the path of the electrons betweenthe electron gun and the target or electronwindow does not exceed 0.1% of the absorbeddose at isocenter.1.5Collimator Transmission: The X-ray transmissionof the upper and lower movable collimator doesnot exceed 0.5%.1.6Spot Size: The electron spot size is less than 3 mm in diameter at the X-ray target.1.7Penumbra: The distance between the 20% and80% isodose lines for a 10 x 10 cm2eld,measured at a depth of 10 cm with a 100 cmTSD along the major axes, measures less than orequal to 9 mm.1.8Field Size: The eld size is continuously variablefrom 0.5 x 0.5 cm2to 40 x 40 cm2as measuredat 100 cm TSD. Field sizes larger than 35 x 35 cm2are limited to a 49.5 cm diagonal (thediameter of the circle dened by the primarycollimator at 100 cm TSD). The eld size isdened as the distance along the radial andtransverse axes between the points of 50%density on an X-ray lm taken at 100 cm TSDwith minimum buildup. The optional SRS 6MV beam eld size is limited to a maximum of15 x 15 cm2. 1.9Upper and Lower Independent Collimators:Asymmetrical collimation is provided for upperand lower sets of collimators.1.9.1 Independent, asymmetrical UpperCollimator travel range: 30 cm (-10 cmto +20 cm relative to central axis)1.9.2 Independent, asymmetrical LowerCollimator travel range: 22 cm (-2 cm to+20 cm relative to central axis)2.0Electron Beams2.1 Clinac iX offers a range of electron energychoices. Clinac iX comes with four (4), ve (5),or six (6) electron beams that can be selected inaccordance with the specications andcombinations listed in Table 2. The specicationsapply to a 15 x 15 cm2electron applicator and100 cm TSD.2.2 Dose Rate: page 3Vari anCl i naci X speci fi cati onsPhoton Energy (BJR17) Photon Dose Rate (MU/min)4 MV 50, 100, 150, 200, 2506 -25 MV (standard) 100, 200, 300 6-25 MV (optional) 100, 200, 300, 4006-25 MV (optional) 100, 200, 300, 400, 500, 600SRS 6 MV (optional) 800 (1000, Trilogy conguration only)6-25 MV (optional) 5, 10, 15, 20, 40, 60, 80An MU is dened for these specications as one centiGraydelivered to a tissue-equivalent material at Dmaxand 100 cm SSD,with a 10 x 10 cm2eld size.Electron Dose Rate (MU/min)100, 200, 300 (standard)100, 200, 300, 400 (optional)100, 200, 300, 400, 500, 600, 1000 (optional)888 at 1.6 m (optional for 6 MeV and 9 MeV)An optional high electron dose rate is available at 6 MeV and 9 MeVelectron energies. Refer to section 8.1 for further information.2.3Field Sizes: A set of ve electron applicators isprovided, with selection from 6 sizes: 6 x 6 cm2,6 x 10 cm2, 10 x 10 cm2, 15 x 15 cm2, 20 x 20 cm2, and 25 x 25 cm2. Field sizes are denedat the isocenter plane, 5 cm from the nal eld-dening aperture. Hardware is provided tofacilitate the fabrication of custom nal elddening apertures.page 4Vari anCl i naci X speci fi cati ons1Depth of Ionization values apply to 15 x 15 cm2applicatorfield size. Electron measurements are made at 100 cm TSDand a nominal 5 cm gap between the bottom of the openfield aperture and the water surface. Measurements aredefined with a 0.1 cm3PTW ionization chamber, orequivalent.2D85%/2 is the depth at which flatness and symmetry arespecified. Values are defined at 100 cm TSD using a 15 x 15cm2electron applicator field size. No inverse squarecorrections are assumed.3Flatness is defined as the maximum variation from themean electron ionization within the central 80% FWHMregion. The mean is the average of the maximum andminimum points within the central 80% FWHM region.This specification applies to square electron applicator fieldsizes from 10 x 10 cm2to 25 x 25 cm2measured on theradial and transverse axes. A specification of 5% is appliedto 6 MeV for 10 x 10 cm2applicator field size. The diagonalflatness specification for the above applicator field sizes is5%, except 4 MeV. The 4 MeV flatness specificationapplies only to the radial and transverse axes.4Symmetry is defined as the maximum difference betweenthe ionization delivered to any two points that areequidistant and symmetrical about the central axis andwithin the central 80% FWHM region. This specificationapplies to the plane normal to the central axis and tosquare electron applicator field sizes from 10 x 10 cm2to 25 x 25 cm2, except 4 MeV. The 4 MeV specification appliesonly to the radial and transverse axes.Table 2: Electron Beam PerformanceElectron Energy GroupsDepth of Ionization1Depth of Dose ValueNominal90% 80% 50% 30% 85%/2 80%Flatness3Symmetry4Energy (cm)2(cm) (MU/min)4.891.00 1.26 2.000.611.007%2% 0.1 cm 0.07 cm 0.1 cm61.711.90 2.30 2.600.931.954.5%2% 0.1 cm 0.07 cm 0.1 cm9 2.682.95 3.50 3.901.453.004.5%2% 0.1 cm 0.07 cm 0.1 cm123.774.15 4.89 5.402.024.254.5% 2% 0.1 cm 0.07 cm 0.1 cm154.68 5.20 6.17 6.80 2.575.354.5% 2% 0.1 cm 0.07 cm 0.1 cm164.875.45 6.49 7.302.675.604.5%2% 0.1 cm 0.07 cm 0.1 cm185.31 6.10 7.41 8.153.046.404.5%2% 0.1 cm 0.07 cm 0.1 cm20 5.526.55 8.13 9.303.266.904.5%2% 0.1 cm 0.07 cm 0.1 cm225.596.80 8.64 10.00 3.377.20 4.5%2% 0.1 cm0.07 cm 0.1 cm4-Electron GroupsNominal Electron(standard) Energy (MeV)Group I4, 6, 9, 12Group II6, 9, 12, 15Group III 6, 9, 12, 165-Electron GroupsNominal Electron(optional) Energy (MeV)Group I6, 9, 12, 15, 18 Group II4, 6, 9, 12, 15Group III6, 9, 12, 16, 20Group IV4, 6, 9, 12, 166-Electron GroupsNominal Electron(optional) Energy (MeV)Group I4, 6, 9, 12, 15, 18Group II6, 9, 12, 15, 18, 22Group III4, 6, 9, 12, 16, 202.4X-ray Contamination: For nominal energies upto 10 MeV, the X-ray contamination is less thanor equal to 2%. For nominal energies greaterthan 10 MeV, the X-ray contamination is lessthan or equal to 5%. This specication is denedin water with a 100 cm TSD, at a depth of 10 cm beyond the depth of the 10% isodoseline, with a 15 x 15 cm2electron applicator.2.5Patient Plane Leakage: Electron leakage is lessthan or equal to 2% of the absorbed dose oncentral axis. This specication is dened in air, at100 cm TSD with 1 cm buildup, in an area 4 cm outside the 50% isodose line.2.6Applicator Side Plane Leakage: The leakagedoes not exceed 9% of central axis ionizationat Dmax. This specification is defined along aplane coincident to the side of the electronapplicator, measuring 10 cm up from thebottom of an applicator.3.0Accelerator System Features3.1RF Power Source: Varians high-efciencyklystron is operated in linear amplier mode anddriven by a solid-state oscillator, with power andfrequency automatically locked to requiredoperating levels.3.2Electron Gun: The unique triode design of theelectron gun allows exact and safe control ofelectron beam levels in the accelerator. Itprovides the ability to rapidly and preciselyvary output dose rate and turn the beam on oroff. This capability is especially important indynamic dose delivery, where high-speed beamgating and elimination of dark current duringbeam-off time periods is important. The gun isdemountable, resulting in minimum systemdowntime during replacement.3.3 Standing Wave Accelerator: The Varian side-coupled cavity accelerator structure has beendeveloped for optimum use of RF power andnarrow output spectrum at the design energyfor the guide. Spectrum characteristics, withand without use of an energy switch, havebeen matched to the transport requirements ofthe downstream bend magnet to ensure highdose rate capability.3.4Patented Non-Contacting Energy Switch: Ineach of the X-ray treatment modes where this isutilized, the switch functions to change the ratioof electric elds between two sections of theaccelerator guide. This is done in such a way asto ensure a tight energy spectrum over a widerange of photon energies, with consequent highoutput capability and stable operation.3.5Solenoid: A full-length magnetic solenoid assureshigh electron beam transmission through theaccelerator structure, resulting in reduced stray-radiation and efcient use of RF power.3.6Bend Magnet: This patented 270 bendmagnet is fully achromatic, with one-to-oneimaging for superior transport and control ofthe beam from the accelerator. The magnet isalso equipped with energy slits fixed at 3%,enabling output beams of consistently highquality and precise dosimetry.3.7Radial and Transverse Steering Systems: Thesesystems ensure basic beam alignment in allmodes, as well as gantry orientation. Ionchamber sensors, in conjunction with thesteering coils and servo electronics, maintainbeam symmetry changes to within 2% underall conditions.4.0Dosimetry SystemThe following specications apply for bothindependent dosimetry channels:4.1Reproducibility with Energy: Precision of thedosimetry measurement system for each energy is1% or 1 MU, whichever is greater, at a xeddose rate.4.2Dose Calibration Linearity versus Total Dose:The linearity is as follows: 1% for 20-999 MU 2% for 10-20 MU 3% for 5-10 MU4.3For photon Beam I and optional Photon BeamII, doses up to 999 MU can be delivered. For theoptional SRS 6 MV Beam, doses up to 6,000MU per eld can be delivered. For all electronbeams, doses up to 4,000 MU can be delivered.page 5Vari anCl i naci X speci fi cati ons4.4Reproducibility of Dose vs. Gantry Angle: Theprecision of the dosimetry system is 1.5% atany gantry angle from 0 to 360 degrees.4.5Reproducibility with Dose vs. Dose Rate: Thedose rate dependence of the dosimetry systemwith variations in dose rate from minimum tomaximum is less than 1% or 1 MU,whichever is greater.4.6Beam-Off Interlocks: The radiation beamautomatically terminates in the event of any ofthe following: Monitor Units 1 complete Monitor Units 2 complete Treatment time complete Radial symmetry exceeds 2% Transverse symmetry exceeds 2% Excess dose rate Excess dose per pulse Excess dose per degree Loss of ion chamber bias voltage Under dose rate5.0Beam Matching SpecificationsBeam matching of a new high energy Clinac iXaccelerator (including the Trilogy conguration) toexisting high-energy Clinac iX accelerators, Trilogycongurations of the Clinac iX accelerator, and low-and high-energy Clinac EX accelerators that meet theserial number requirements shown below is availableas a purchasable option. If purchased, this optionincludes on-site demonstration of the matched beamsas described below. Basic or Fine Beam Matching to existing acceleratorsystems installed outside a 1-year time frame may beavailable as a purchasable option (refer to section 5.3).5.1 Restrictions and Denitions5.1.1 All specications apply to elds measuredin water with the surface 100 cm fromthe target of the accelerator system.5.1.2 Dmaxis the depth at which the maximumdose occurs along the central axis of thebeam for a 10 x 10 cm2X-ray eld.5.1.3R85/2 is one-half the depth where 85%relative ionization occurs on the centralaxis of an electron eld using the 15 x 15 cm2applicator.5.1.4 Major axes lines orthogonal to the centralaxis of the beam and perpendicular to thesides of rectangular elds.5.1.5 The term average is dened as theaverage value for the referencedperformance specication, calculatedusing measurements obtained from thenew high energy Clinac iX acceleratorand the existing accelerator systems(s) towhich it is matched.5.2 On-Site Demonstration of Matched Beams5.2.1 Basic Photon Beam Matching, per beam5.2.1.1 Basic Matching of Photon X-Ray Beam Energy: For eachX-ray beam of the samenominal energy, the depth ofDmaxalong the central axis ina water phantom at 100 cmTSD is within 1.5 mm of theaverage. For each X-ray beamof the same nominal energy,the relative dose at 10 cmdepth on the central axis in awater phantom at 100 cmTSD (normalized to the doseat Dmax)is within 1.0% ofthe average.5.2.1.2 Basic Matching of Photon X-Ray Beam Flatness: For X-ray beams of the samenominal energy, the maximumdose in the plane normal to thebeam axis at a depth of Dmax inwater at 100 cm TSD is within1% of the average. For eachbeam of the same nominalenergy, the dose at any pointwithin the central 80% of thein-plane and cross-plane axes,normalized to the central axis,measured at a depth of 10 cmin water at a TSD of 100 cm iswithin 2% of the average forthe measured values at thatpoint. This specication appliesto X-rays at 10 cm depth andeld dimensions greater than10 x 10 cm2.page 6Vari anCl i naci X speci fi cati ons5.2.2 Basic Electron Beam Matching, perbeam5.2.2.1 Basic Matching of ElectronBeam Energy: For each electronbeam of the same nominalenergy, the relative ionization at100 cm TSD, the depth of90%, 80%, and 50%, is within1.0 mm of the average. Thisspecication applies to the 15 x15 cm2applicator.5.2.2.2 Basic Matching of ElectronBeam Flatness: Basic matchingof electron beams does notinclude atness.5.2.3 Fine Photon Beam Matching, per beam5.2.3.1 Fine Matching of Photon X-Ray Beam Energy: For eachX-ray beam of the samenominal energy, the depth ofDmaxalong the central axis inwater phantom at 100 cmTSD is within 1.5 mm of theaverage. For each X-ray beamof the same nominal energy,the relative dose at 10 cmdepth on the central axis in awater phantom at 100 cmTSD (normalized to the doseat Dmax) is within 0.5% ofthe average.5.2.3.2 Fine Matching of Photon X-Ray Beam Flatness: For X-ray beams of the samenominal energy, the maximumdose in the plane normal to thebeam axis at a depth of Dmaxinwater at 100 cm TSD is within1% of the average. For eachbeam of the same nominalenergy, the dose at any pointwithin the central 80% of thein-plane and cross-plane axes,normalized to the central axis,measured at a depth of 10 cmin water at a TSD of 100 cm iswithin 2% of the average.This specication applies to X-rays at 10 cm depth and elddimensions greater than 10 x10 cm2.5.2.4Fine Electron Beam Matching, per beam5.2.4.1 Fine Matching of ElectronBeam Energy: For each electronbeam of the same nominalenergy, the relative ionizationvalues of 90%, 80%, and 50%at 100 cm TSD, are within1.0 mm of the average. Thisspecication applies to the 15 x15 cm2applicator.5.2.4.2 Fine Matching of ElectronBeam Flatness: For each beamof the same nominal energy, theionization at any point withinthe central 80% of the in-planeand cross-plane scans,normalized to the central axis,measured at the depth of Dmaxin water at a TSD of 100 cm iswithin 2% of the average ofthe measured values at thatpoint. This specication appliesto the 25 x 25 cm2and 10 x 10 cm2applicators.5.3Beam Matching to Accelerator Systems InstalledOutside a 1-Year Time Frame 5.3.1 Basic or Fine Beam Matching, includingon-site demonstration, of a new highenergy Clinac iX accelerator to existingaccelerator systems installed outside a 1-year time frame is available as apurchasable option for acceleratorsystems that meet the followingrequirements: Clinac iX, all serial numbers Trilogy conguration, all serial numbers Low-energy Clinacs, serial number 244and higher Clinac 21 series, serial number 865and higher Clinac 23 series, serial number 144and higher Silhouette edition Clinacs, all serialnumberspage 7Vari anCl i naci X speci fi cati ons5.3.2Basic or Fine Beam Matching, includingon-site demonstration, of a new highenergy Clinac iX accelerator to existingaccelerator systems that do not meet theserial number requirements above maybe available as a purchasable option.6.0Mechanical Features6.1Gantry6.1.1Rotation Range: 185 from the vertical6.1.2Target to Axis Distance: 100 0.2 cm6.1.3Mechanical and radiation isocenteraccuracy - Standard Beam IsocenterAccuracy6.1.3.1 1 mm radius sphere for gantryand collimator axes withoutRetractable Beam Stopper6.1.3.2 1 mm radius sphere forgantry, collimator, and couchaxes without Retractable BeamStopper6.1.3.3 2 mm radius sphere for gantryand collimator axes withRetractable Beam Stopper6.1.3.4 2 mm radius sphere forgantry, collimator, and couchaxes with Retractable BeamStopper6.1.4 Mechanical and radiation isocenteraccuracy - Optional Fine Beam IsocenterAccuracy6.1.4.1 Not available with RetractableBeam Stopper6.1.4.2 Requires 52-inch ExactCouch base frame6.1.4.3 0.5 mm radius sphere forgantry and collimator axes6.1.4.4 0.75 mm radius sphere forgantry, collimator, and couchaxes6.1.5 Position Indicators6.1.5.1 Scale Conventions6.1.5.1.1 IEC Scale conventionper IEC Publication601-2-1, 19816.1.5.1.2 IEC 1217 Scaleconvention per IECPublication 60601-2-1,2nd Edition, 19986.1.5.1.3 Varian Scale6.1.5.2 Digital Readouts: Accuracy: 0.5 Resolution: 0.1page 8Vari anCl i naci X speci fi cati ons433(43.3 cm)(17")1295(129.5 cm)(51")1070(107 cm)(42")1260(126 cm)(49.6")32(3.2 cm)(1.25")2008(200.8 cm)(79")2584(258.4 cm)(102")3236(323.6 cm)(127.4")1832(183.2 cm)(72")552(55.2 cm)(21.7")Clinac iX DimensionsIllustration not to scale6.1.5.3 Mechanical Scales: Accuracy: 1.0 Resolution: 1.06.1.5.4 Gantry Display Only: OptionalEnhanced Dynamic Wedge(EDW) graphic indicatorshows that EDW is enabled ineither Y1 or Y2 direction.6.1.6Target to Surface Distance Indicators6.1.6.1 Optical Distance Indicator: Accuracy: 0.1 cm at 100 cm0.5 cm at 70 cm and 156 cm Resolution: 0.5 cm6.1.6.2 Mechanical Front Pointer: Range: 70-110 cm Accuracy: 0.1 cm at 100 cm Resolution: 0.2 cm6.1.7Isocenter Height (nominal): 129.5 cm 6.2 Collimator6.2.1Extended Rotation Range: 1656.2.2Position Indicators (gantry and console)6.2.2.1Digital Readouts: Accuracy: 0.5 Resolution: 0.16.2.2.2Mechanical Scales: Accuracy: 1.0 Resolution: 1.06.3Field Size Collimation6.3.1Range: The eld size is continuouslyvariable from 0.5 x 0.5 cm2to 40 x 40 cm2as measured at 100 cm TSD.Field sizes larger than 35 x 35 cm2arelimited to a 49.5 cm diagonal (thediameter of the circle dened by theprimary collimator at 100 cm TSD).The eld size is dened as the distancealong the radial and transverse axesbetween the points of 50% density onan X-ray lm taken at 100 cm TSD withminimum buildup. The optional SRS 6MV beam eld size is limited to amaximum of 15 x 15 cm2. 6.3.2Position Indicators Accuracy: 0.2 cm Resolution: 0.1 cm6.3.3Light and X-ray Field Coincidence: Theeld-dening light coincides to within1.5 mm of the 50% isodensity line onan X-ray lm. This is dened at 100 cmTSD with minimum buildup for anyeld size.6.4Exact Couch with Indexed Immobilization6.4.1The Exact Couch is standard withClinac iX accelerators. (Specicationsand standard vs. optional accessories forthe Exact Couch are provided onspecication sheet RAD 1951A.) 6.4.2Motion Controls Two Hand Pendants that control bothClinac iX and Exact Couch Two Couch Side Panels Optional Remote Couch Control6.4.3 Position Indicators6.4.3.1 Translation Accuracy: 0.1 cm Resolution: 0.1 cm6.4.3.2 Rotation Accuracy: 0.5 Resolution: 0.16.5 Compact stand assembly6.5.1 Single access and through-door viewingof all gas and water system statusindicators6.5.2 Optional imager electronics(PortalVisionMV imaging system andOn-Board Imager kV imaging system)incorporated in reduced height stand page 9Vari anCl i naci X speci fi cati ons7.0AccessoriesThe following accessories are included as standardwith Clinac iX and the Exact Couch:7.1 Collimator Accessories: Interface Mount Accessory Mount Port Film Graticule 4-Way Wedge Set (four wedges 15, 30, 45,60) Five Electron Applicators: A set of ve electronapplicators is provided, with selection from 6 sizes: 6 x 6 cm2, 6 x 10 cm2, 10 x 10 cm2,15 x 15 cm2, 20 x 20 cm2, and 25 x 25 cm2. Custom Aperture Fabrication Hardware Mechanical Front Pointer (holder and 4 rods) Drilled Star or solid block trays (Qty 10 -0.635 cm thickness)7.2Accessory Spare Parts Kit8.0Optional Treatment Procedures8.1Optional High Dose Total Skin ElectronMode: The Clinac iX accelerator is capable ofdelivering electron treatments at high doserates for the purpose of total body skinirradiation with electrons. The dose rate at 1.6 m is 888 MU/min, corresponding tonominally 2,500 MU at isocenter. This modeis available in 6 MeV or 9 MeV.8.1.1X-ray contamination at calibration pointis