Varian

23EX

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Varian23EX

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What is it?

The Varian 23EX is part of the Clinac series and features a klystron power source. It supports 80- or 120-leaf multi-leaf collimators and optional on-board imaging (OBI) for kV imaging and cone-beam CT. Treatment capabilities include 3D conformal and IMRT, with optional stereotactic radiosurgery/radiotherapy.

What can it run?

Process applications and technology nodes documented for this tool.

3D conformal radiation therapy
Intensity-modulated radiation therapy (IMRT)
Stereotactic radiosurgery/stereotactic body radiation therapy (SRS/SBRT) (optional)

Why won't it start?

Documented failure modes, common issues, and field considerations.

Missing modern features unless retrofitted (CBCT, RapidArc)
Some units near end-of-life needing refurbishment

What do the numbers mean?

Dimensions & facilities1

Multi-Leaf Collimator (MLC): 80-leaf (field size 40x40 cm); optional 120-leaf (central 20 cm: 5 mm leaf width, outer 20 cm: 10 mm leaf width)^[1]

Configuration & options10

Power Source: Klystron^[1]
Photon Energy Configuration: 6 & 10/15/18/25 MV^[1]
Max Dose Rate Photons: 600 MU/min^[1]
Electron Energies: Yes^[1]
Max Dose Rate Electrons: 1000 MU/min^[1]
Portal Imager (EPID): LC250, aS500, aS1000 (optional)^[1]
KV Imaging for IGRT: OBI (optional)^[1]
Cone-Beam CT: Only with OBI^[1]
VMAT: Only with OBI^[1]
Treatment Couch: Exact ETR, Exact (optional)^[1]

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What replaced it?

siblingVarian 2300C/D— Another variation of the Clinac 2100C/2100CD line listed alongside 2300C/Dsource^[1]

Where are the manuals?

Generated from public-source data on file. Enter your email to access — nothing is published; details are routed privately.

Not publicly documented

Field notes

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Frequently asked questions

What power source does the Varian 23EX use?

The Varian 23EX uses a klystron as its power source.^[1]

What photon energies are available on the 23EX?

The 23EX can produce photon energies of 6, 10, 15, 18, and 25 MV.^[1]

What is the maximum dose rate for photons on the 23EX?

The maximum dose rate for photons is 600 MU/min.^[1]

During which years was the 23EX manufactured?

The 23EX was manufactured between 1998 and 2012.^[1]

Not publicly documented

The following facts about the 23EX are absent from this record as of this revision. First-hand knowledge or a citation closes a gap; every submission is reviewed before publication.

No publicly documented production dates or lifecycle milestones (introduction, end of production, EOL) for the 23EX are on record.
Answerable by: OEM historical records or a trade-press announcement
No publicly documented variants, configuration options, or revision breakpoints of the 23EX are on record.
Answerable by: an OEM product catalog or an engineer who ordered or specified the tool
The control-system platform and OS era of the 23EX are not on record.
Answerable by: an engineer who operated it or OEM installation records
The process node or technology generation of the 23EX is not on record.
Answerable by: an OEM datasheet or a fab qualification report
No publicly documented compatible parts, consumables, or accessories for the 23EX are on record.
Answerable by: an OEM parts catalog or a service engineer