23 research outputs found
Plasmacytoma of Bronchus Treated by Radical Radiotherapy-A Rare Case with Four and a Half Years Follow up
AbstractPlasmacytoma of the bronchus is a very rare plasma cell neoplasm affecting the bronchus. Here we report a case of plasmacytoma of the bronchus treated by radical radiotherapy in July 2002. The tumor responded very well to treatment and showed a slow but sustained regression in the size over two years. Presently, he has completed four and a half years of follow-up and is free of disease
Field-in-Field Technique For Upper Abdominal Malignancies in Clinical Radiotherapy
Background: In upper abdominal malignancies (UAM), due to the presence
of multiple inhomogeneous tissues, a wedge-based conformal treatment
planning results in high-dose regions inside the target volume. Aim:
This study was designed to explore the feasibility of using a
field-in-field (FIF) technique in different UAM and its efficacy in
reducing the high-dose regions. Materials and Methods: Twelve patients
of UAM (which included malignancies of the gastroesophageal junction,
stomach, gall bladder, and pancreas) were selected for this study.
Computed tomography (CT) scans were performed and three-dimensional
conformal wedge plans were generated for all the cases. The same plan
was copied with the wedges removed and a FIF plan was generated. The
two plans were compared for mean, maximum, and median doses; dose
received by 2% (D2) and 98% (D98) of the target volume; volume
receiving> 107% (V > 107%) and < 95% (V < 95%) of the
prescribed dose; conformality index (CI); and total monitor units. The
doses to critical structures such as liver, kidneys, and spinal cord
were also compared. Statistical Analysis: Statistical analysis was
performed with SPSS, version 10.0. Results: For all the cases, the FIF
technique was better than wedge-based planning in terms of maximum
dose, D2, V > 107%, and CI; there was a statistically significant
reduction in monitor units. With regard to doses to critical
structures, there was marginal dose reduction for the kidneys and
spinal cord with FIF as compared to wedge-based planning. Conclusion:
The FIF technique can be employed for UAM in place of wedge-based
conformal treatment plans
Field-in-Field Technique For Upper Abdominal Malignancies in Clinical Radiotherapy
Background: In upper abdominal malignancies (UAM), due to the presence
of multiple inhomogeneous tissues, a wedge-based conformal treatment
planning results in high-dose regions inside the target volume. Aim:
This study was designed to explore the feasibility of using a
field-in-field (FIF) technique in different UAM and its efficacy in
reducing the high-dose regions. Materials and Methods: Twelve patients
of UAM (which included malignancies of the gastroesophageal junction,
stomach, gall bladder, and pancreas) were selected for this study.
Computed tomography (CT) scans were performed and three-dimensional
conformal wedge plans were generated for all the cases. The same plan
was copied with the wedges removed and a FIF plan was generated. The
two plans were compared for mean, maximum, and median doses; dose
received by 2% (D2) and 98% (D98) of the target volume; volume
receiving> 107% (V > 107%) and < 95% (V < 95%) of the
prescribed dose; conformality index (CI); and total monitor units. The
doses to critical structures such as liver, kidneys, and spinal cord
were also compared. Statistical Analysis: Statistical analysis was
performed with SPSS, version 10.0. Results: For all the cases, the FIF
technique was better than wedge-based planning in terms of maximum
dose, D2, V > 107%, and CI; there was a statistically significant
reduction in monitor units. With regard to doses to critical
structures, there was marginal dose reduction for the kidneys and
spinal cord with FIF as compared to wedge-based planning. Conclusion:
The FIF technique can be employed for UAM in place of wedge-based
conformal treatment plans