Tomotherapy Process



 

CT Scanning

The first step of Tomotherapy treatment is to have a CT scan done. The patient is set-up on our PET/CT scanner flat table top with immobilizing devices to ensure reproducibility and comfort. After the CT scan is done the origin of the scan is tattooed on the skin. The tattoos are very tiny dot marks which assist in positioning the patient during the treatment course on a daily basis.The images are then exported to our Varian Eclipse contouring workstation.

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Contouring and Prescription

Contouring, simply stated is drawing the tumor volume and the surrounding normal structures on the CT images. This is a very important task in achieving success in Radiation treatment. Contouring is done at our Varian-Eclipse contouring station. The doctor then decides how much radiation the tumor
should receive, as well as acceptable levels for surrounding structures.

Our radiation oncologist may use PET or MRI images along with the CT images
to accurately identify the target to treat and normal structures to spare. Once
the contouring process is completed, the CT images along with the structures drawn is exported to the Tomotherapy planning station for radiotherapy planning.

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Radiotherapy Isodose Planning

Isodose planning is done at the TomoTherapy planning station in Physics
and dosimetry area. The CT images after contouring is imported into the TomoTherapy planning station.Every plan is individualized and made for
the specific needs of every case.

The Day of Treatment

After checking in for a daily treatment, the patient will be taken to the TomoTherapy treatment room where our radiation therapist will help them onto the TomoTherapy treatment table. The patient will most likely lie on their back, and our therapist may fit them with a special immobilizing device to help them hold still during treatment.

First, the table will move the patient through the machine once for daily CT imaging. Based on these images, the therapist may fine tune the patient’s position via small table adjustments. Then the couch will move the patient through the machine once again, this time more slowly, as the Tomotherapy system delivers the daily treatment.

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Continuous 360º Treatment Delivery

The TomoTherapy treatment system delivers intensity-modulated radiation therapy (IMRT) with a helical (spiral) delivery pattern. Photon radiation is produced by a linear accelerator (or linac for short), which travels in multiple circles around the patient and moves in unison with a device called a multi-leaf collimator, or MLC. Meanwhile, the couch is also moving—guiding the patient slowly through the center of the ring. Each time the linac makes a loop around the patient it directs a unique, optimized set of radiation beamlets at the tumor. Quite literally, the Tomo process runs rings around cancer!

What You Can Expect

The number of treatments varies by case. On the average, the full daily TomoTherapy procedure takes about 30 minutes from when the patient enters the treatment room until they leave. This includes about five minutes for the daily CT to be performed and another five minutes for treatment to be delivered (“beam-on time”). The remaining time is used for patient set-up and image registration for proper positioning. TomoTherapy treatments are completely painless. The experience is similar to having a CT scan or an X-ray taken.

You may hear a clicking noise and the hum of the machine, both of which
are normal sounds that the machine makes. During the treatment, our Tomo
team will be monitoring the patient with CCTV cameras and also be able to communicate with our audio systems.

  • Ali R. Lakhani Ali R. Lakhani, M.D.
  • Arvind Kumar Arvind Kumar, M.D.
  • Ellen J. Gustafson Ellen J. Gustafson, M.D.
  • Jason J. Suh Jason J. Suh, M.D.
  • Kulumani M.Sivarajan Kulumani M.Sivarajan, M.D.
  • Nafisa Burhani Nafisa Burhani, M.D.
  • Nicholas Galanopoulos Nicholas Galanopoulos, M.D.
  • Ommar Hla Ommar Hla, M.D.
  • Patrick McGinnis Patrick McGinnis, M.D.
  • Sanjiv S. Modi Sanjiv S. Modi, M.D.
  • Sarode K.Pundaleeka Sarode K.Pundaleeka, M.D.
  • Silviya Velinova Silviya Velinova, M.D.
  • Virag Dandekar Virag Dandekar, M.D.
  • Worood Abboud Worood Abboud, M.D.

JOHA FOUNDATION
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