VMAT Treatment in Raipur

Volumetric Modulated Arc Therapy or VMAT is an advanced form of radiation therapy in which the linear accelerator rotates continuously around the patient in one or more arcs, delivering radiation from every angle simultaneously while dynamically modulating three parameters during each arc: the dose rate of the beam, the shape of the beam (controlled by the multi-leaf collimator) and the speed at which the gantry rotates. The result is a treatment that conforms dose to the tumour volume from all directions at once, achieving highly conformal coverage of the target while reducing dose to surrounding normal tissue.

VMAT builds on Intensity-modulated radiation therapy (IMRT) principles but delivers far more efficiently - compressing what might be a 15 to 20-minute IMRT session into two to four minutes of arc delivery. Shorter delivery times also reduce the opportunity for intrafraction patient movement to compromise positioning accuracy.

At Ramkrishna CARE Hospitals, Raipur, VMAT is delivered on the Elekta Versa HD linear accelerator with IntelliBeam technology with up to 1,024 dynamic control points per arc compared with 180 on conventional systems. The Agility MLC with 6.5 cm/s leaf speed modulates beam shape at the pace that VMAT demands and Monaco Monte Carlo dose calculation ensures that the planned dose distribution reflects what is actually delivered in tissue.

Why is VMAT Treatment Performed?

VMAT is preferred when:

• Tumours adjacent to radiosensitive structures: Selected for prostate near rectum and bladder; head and neck near the spinal cord, brainstem and salivary glands; lung adjacent to the oesophagus
• Simultaneous Integrated Boost (SIB): Different dose levels to gross tumour and elective target in the same arc session
• SBRT and SRS: High-dose, few-fraction treatments for lung, liver, spine and brain where steep dose gradients are mandatory.

Conditions Treated with VMAT

Doctors recommend VMAT in certain conditions:

• Prostate cancer: VMAT with daily IGRT is the standard technique for definitive prostate radiotherapy and for SBRT five-fraction prostate treatment
• Head and neck cancers: Include oropharynx, larynx, hypopharynx and nasopharynx; VMAT's ability to spare the parotid glands, spinal cord and mandible simultaneously across multiple dose levels makes it the preferred technique
• Lung cancer: Definitive VMAT-IMRT for locally advanced NSCLC and SBRT for early-stage peripheral lung tumours
• Brain tumours and brain metastases: Whole-brain radiotherapy with hippocampal avoidance and VMAT-based SRS for brain metastases and benign intracranial lesions on the Versa HD
• Breast cancer: Post-mastectomy chest wall VMAT and whole-breast VMAT with deep inspiration breath-hold to reduce cardiac dose in left-sided disease.

Diagnosis Before VMAT Treatment

A thorough evaluation is performed before VMAT treatment to accurately locate the tumour and create a personalised radiation therapy plan:

• Histological confirmation: Confirming cancer type and grade that help determine dose, fractionation and target volumes
• CT simulation: A planning CT in the treatment immobilisation device that determine the patient positioned exactly as they will be for every subsequent fraction
• MRI and PET CT fusion: MRI provides superior soft tissue delineation for brain, prostate and rectal targets; PET CT from the uMI 550 Digital PET CT with 2.76mm resolution and Time-of-Flight imaging defines metabolically active tumour volumes for lung, head & neck and lymphoma. PET CT and MRI datasets are fused with the planning CT to allow target delineation on co-registered multi-modality imaging
• Monaco treatment planning: Monte Carlo dose calculation optimises arc parameters to meet target and critical structure constraints. Monte Carlo accuracy at tissue interfaces (lung, bone & air) ensures planned dose reflects what is actually delivered

VMAT Treatment Procedure

Treatment steps are:

• Patient positioning and immobilisation: The patient is placed in their immobilisation device and aligned to laser reference marks established at CT simulation
• Pre-treatment IGRT imaging: The Versa HD's XVI cone-beam CT system acquires volumetric images of the treatment region. These are registered to the planning CT to verify that the target is in the planned position before treatment proceeds
• Position correction: Any translational or rotational deviation detected by CBCT is corrected by the HexaPOD six-degree-of-freedom couch before treatment begins
• VMAT arc delivery: The gantry rotates continuously around the patient for two to four minutes per arc. The MLC shape, dose rate and gantry speed change dynamically throughout each arc

Risks and Side Effects

Possible side effects are:

• Fatigue: Accumulates through the course and typically resolves two to four weeks after treatment completion
• Head and neck VMAT: Mucositis, xerostomia, dysphagia and taste changes (VMAT's parotid sparing substantially reduces xerostomia risk)
• Prostate VMAT: Urinary frequency, urgency, and loose stools 
• Lung VMAT: Cough and fatigue however VMAT's lung dose reduction compared with conventional techniques reduces pneumonitis risk.

Benefits of VMAT

VMAT is an advanced radiation therapy technique that improves treatment accuracy while reducing radiation exposure to surrounding healthy tissues:

• Highly conformal dose: VMAT's continuous arc delivery achieves dose conformality that closely follows even complex concave tumour shapes outperforming conventional fixed-field radiotherapy 
• Fast treatment delivery: Two to four minutes of arc delivery compared to 15 to 20 minutes for equivalent IMRT, reducing intrafraction motion risk and patient discomfort
• Simultaneous Integrated Boost: Different dose levels to gross tumour and elective volumes in the same session
• Superior normal tissue protection: The rotating arc distributes low dose radiation across a large volume of normal tissue, reducing the dose to any single structure
• IGRT integration: CBCT position verification and HexaPOD correction before each fraction ensures conformal dose is delivered to the correct target
• SBRT capability: Steep dose gradients enable stereotactic ablative radiotherapy for the lung, liver, spine and prostate in a few fractions with doses that would be impossible with conventional delivery.

Why Choose Ramkrishna CARE Hospitals for VMAT Treatment in Raipur?

Ramkrishna CARE Hospitals combines advanced VMAT technology with expert clinical care to deliver precise and personalised radiation treatment:

• Elekta Versa HD: IIntelliBeam with 1,024 dynamic control points per arc that provides the modulation complex VMAT plans require
• HexaPOD six-degree-of-freedom positioning: VMAT conformality is meaningless without accurate patient position. The HexaPOD corrects translational and rotational deviations detected by CBCT before each arc - submillimeter accuracy at every fraction
• Monaco Monte Carlo planning: Uses highly accurate dose calculations to create personalised treatment plans even for complex tumours
• uMI 550 PET CT for target definition: The uMI 550's 2.76mm resolution and Time-of-Flight imaging define metabolically active tumour volumes, ensuring VMAT treats biological disease extent
• Multidisciplinary treatment review: Every VMAT plan is reviewed at our multidisciplinary tumour board so target volumes and dose constraints reflect collective clinical judgement
• Full oncological programme: VMAT is the radiation component of a complete cancer programme including systemic therapy, surgery and radiation coordinated within the same multidisciplinary team.

Conclusion

VMAT is the current standard for high-precision external beam radiation therapy, delivering conformal doses in minutes per fraction, with the flexibility to treat complex targets, simultaneously boost high-risk volumes and deliver stereotactic doses previously achievable only with dedicated radiosurgery systems.

At Ramkrishna CARE Hospitals, Raipur VMAT is delivered on the Elekta Versa HD with IntelliBeam, Monaco Monte Carlo planning, IGRT-verified positioning and safety verification. For patients across Chhattisgarh requiring precision radiation therapy this level of technical capability is available in Raipur at Pachpedi Naka, Dhamtari Road.