Manually adjustable fixed laser system for patient positioning at LINAC

Key figures
units per year
units per year
degrees of freedom
degrees of freedom
mounting options
mounting options
laser colors
laser colors

Cost-conscious positioning precision



At a distance of 1 to 4 meters, the maximum laser line width is 1 mm. Each line has been measured along its entire length and has a line straightness of ± 0.1 mm. In this way, you can always rely on the precision of your lasers.

Practical adjustable

Fine adjustment of the laser lines (parallel shift, tilt, rotation and focus) can be done manually with an Allen key.


A high-quality aluminum housing reliably protects the fine mechanics and optical components inside. The housing withstands even strong impacts and and reduces misalignment due to vibration.

Optimally visible

The different red and green diode colors and the optical components are designed and manufactured with highest accuracy. Plane parallel glass with anti-reflective coating prevents any interference with the laser beam. The brightness distribution remains constant at all times. Benefit from optimal visibility for precise patient positioning.

Fits your room

With the optional accessories, the lasers can be optimally adapted to your individual treatment room. Whether you need to bridge a false ceiling, have the lasers free standing, or have the laser project from a different angle (by default, the ASTOR can be tilted up to 45°), you can install your lasers safely, practically, and aesthetically.

Resistant to radiation

In environments surrounding linear accelerators, scattered radiation occurs. Our room lasers were irradiated with the expected dose over their entire lifetime and optimized to these conditions.The many years of availability without compromising on quality is an exceptional track record that speaks for itself.

Technical data

Dimensions (L× W × H) 205 x 86 x 93 mm (8.1 x 3.4 x 3.7")
Weight 1.4 kg
Laser color (typical wave length) red (635 nm), green (520 nm)
Laser class 2
Line width up to 4 m distance < 1 mm
Line length at 3 m distance > 3 m
Power supply 100–240 V AC
Power supply (internal) 24 V DC
Operating temperature 15–30 °C

Application examples

See how the Reference Point Marking workflow can be applied at LINAC. This video helps to figure out how you would like to work in your Radiation Therapy. 

Find out how the Absolute Marking Workflow can be applied at LINAC and how it helps to save precious time. This video helps to figure out how you would like to work in your Radiation Therapy. 


How can I configure the ASTOR?

You can configure each ASTOR as you need to. Preconfigured sets of three or four lasers to project the coronal, sagittal and transversal plane are available. A fourth laser prevents shadowing from the LINAC gantry. You can configure the laser color of the system and for each laser in line or cross laser and mounting option, all adapted to your individual room situation. 

Which color should I choose?

Historically, red was the only laser color that could be technically realized for a long time. Today, the laser colors red and green can also be offered. Here, the human eye perceives green as a sharper line than red.  Another aspect you should consider is the skin color of your patients. Overall, after 20 years of experience, it can be stated that the green laser color is the most popular.

How long is the laser line?

The length of the laser line is equal to the distance between laser source and patient. Therefore, for example, the laser line is only one meter long at a distance of one meter, but 4 meters long at a distance of 4 meters. 

Further resources

This webinar focuses on how lasers make the difference in patient positioning at LINAC and how to combine imaging with treatment.

Go to top