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ORIGINAL ARTICLE
Year : 2015  |  Volume : 38  |  Issue : 4  |  Page : 139-143

Dosimetric study for the development of heterogeneous chest phantom for the purpose of patient-specific quality assurance


1 Department of Physics, Mewar University, Chittorgarh, Rajasthan; Roentgen-SAIMS Radiation Oncology Centre, Sri Aurobindo Institute of Medical Sciences, Indore, Madhya Pradesh, India
2 Department of Physics, Mewar University, Chittorgarh, Rajasthan; Department of Radiotherapy, Gajra Raja Medical College, Gwalior, Madhya Pradesh, India
3 Department of Radiotherapy, King George Medical College, Lucknow, Uttar Pradesh, India
4 Roentgen-SAIMS Radiation Oncology Centre, Sri Aurobindo Institute of Medical Sciences, Indore, Madhya Pradesh, India
5 Department of Physics, Mewar University, Chittorgarh, Rajasthan; Department of Radiotherapy, Dr. Ram Manohar Lohia Institute of Medical Sciences, Lucknow, Uttar Pradesh, India

Correspondence Address:
Om Prakash Gurjar
Roentgen-SAIMS Radiation Oncology Centre, Sri Aurobindo Institute of Medical Sciences, Indore - 453 111, Madhya Pradesh
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0972-0464.176155

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To analyze the dose absorption patterns of 6 Megavoltage (MV) photon beam using computed tomography (CT) slices of thorax of patient, slab phantom, and slab–kailwood–slab phantom. Single beam of 6 MV with field size of 10 × 10 cm 2 was put on CT images of chest wall, slab phantom, and slab–kailwood–slab phantom perpendicular to the surface. Dose was calculated using anisotropic analytical algorithm. Densities of each medium were calculated by Hounsfield units measured from CT images of each medium. The depths of isodose curves of 100%, 95%, 90%, 85%, 80%, 70%, 60%, and 50% were measured in all the three mediums. The densities measured for chest wall, lung, Soft tissue behind lung, slab phantom, and slab–kailwood-slab phantom were 0.89, 0.301, 1.002, 0.998, and 0.379 g/cc, respectively. The isodose depth (100%, 95%, 90%, 85%, 80%, and 50%) for patient (1.5, 2.76, 3.97, 5.33, 7.01, and 20.01 cm), slab phantom (1.5, 2.74, 3.92, 5.06, 6.32, and 15.18 cm), and slab–kailwood–slab phantom (1.5, 2.65, 3.86, 4.98, 5.95, and 20 cm) is approximately same for 100%, 95%, 90%, and 85% isodose curves. The isodose depth pattern in the chest is equivalent to that in slab–kailwood–slab phantom. The radiation properties of the slab–kailwood–slab phantom are equivalent to that of chest wall, lung, and soft tissue in actual human. The chest phantom mimicking the actual thoracic region of human can be manufactured using polystyrene and the kailwood.


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