November 18, 2016

Finding the Zero Slice in CT Treatment Planning

The goal of the radiation therapist is to accurately locate the central axis or zero slice on the tumor field for treatment planning. A skin marker with a distinct shape that clearly defines the area of focus as you are scrolling through the images can save you time and improve accuracy.

Using a crosshair marker in the formation of an “X” during treatment planning creates a unique shape that helps the radiation oncology team determine the zero slice.

Gayle Crowley, Chief Therapist at the Harold Leever Regional Cancer Center in Waterbury, CT, describes how she utilizes this technique: 

“We all know what it’s like scrolling through CT images looking for those magical marks or the 3 points on the patient. We use Beekley Medical's CT-SPOT® crosshair for our 3-point set-ups and we place them on the patient in an 'X' configuration. CT-SPOT Crosshair 

The lasers are projected as a “t” on the patient’s skin. By placing the CT-SPOT® crosshair as an 'X' over the lasers you know that is the center of the mark on your patient’s skin. During imaging it helps us identify the zero slice or central axis of the treatment field to accurately line these up. As you scroll through the slices you will first see the two individual legs of the 'X.' CT-SPOT Crosshair used in 3 point set-up

As you approach the center of the 'X' you will notice a distinct shape. This distinct shape makes it easier for the therapist to discern the zero slice." 

For more tips on how Bekeley Medical can help you achieve greater precision, accuracy, and patient care, download your copy of "Solutions to Daily Challenges in Radiation Oncology" or contact your Business Development Manager at 1-800-233-5539 or +1-860-583-4700.


Related Content:

Reducing Artifact as an Obstacle in CT Dosing and Treatment Planning

Overcoming Challenges with Temporary Set-Up Marks in Radiation Oncology




Jonathan McCullough
Product Manager
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