For the changes in longitudinal direction (Z), there was a slight difference between both positions (0.49cm vs. For the secondary analysis, setup error in lateral (x) direction was higher in SLDP (0.66cm vs.0.49cm, p=0.028), setup error in vertical (y) direction in SLDP was lower than SP (0.39cm vs. 20.3%) with a statistically significant difference ( p<0.01). The mean dose to the ipsilateral lung was slightly higher than SP (22.5% vs. However, it achieved slightly a higher mean dose to the thyroid gland (79.8Gy vs. SLDP decreased the mean dose to the contralateral breast (2.27Gy vs. 12.6Gy) with a ( p<0.01), while maintaining a similar coverage to the axillary lymph nodes levels I, II and III and the SCV group (91.13%, 89.9%, 88.9% and 93.9% vs. 7.2Gy) and the Spinal cord D max (7.5Gy vs. Results: On dosimetric analysis of the two positions, SLDP was found to significantly decrease the mean dose to the heart when compared with SP (2.2Gy vs. Secondly, analysis was conducted on the fifty patients who were treated in SLDP by ALB-16 in comparison with a control group treated in SP to determine ALB-16 reproducibility. The mean radiotherapy dose to the CW/WB, axilla, thyroid, left lung, heart, LAD, Spinal cord and the contra-lateral right breast in SLDP and the SP for the same patient were compared. Fifty women with a left sided breast cancer who underwent either mastectomy or lumpectomy were enrolled in this study for dosimetric comparison between the SLDP and the SP. Simulation process was performed in two different positions whilst the patients were freely breathing, the first scan in SLDP and the second in SP. Methods: We invented a new breast board ALB-16 to induce SLDP allowing tilting the patient towards the right side, elevating the patient's left side at a certain angle adjusted according to the patient’s body surface area and the gantry width of the CT simulator. ![]() Our purpose is to compare the Semi-lateral decubitus position(SLDP) versus SP regarding the dose distribution to the left Chest wall/Whole breast (WB), ipsilateral left axilla, contra-lateral breast, thyroid, spinal cord, ipsilateral lung, heart, LAD (Left Anterior Descending Artery), as well as determining the reproducibility of the Alexandria left breast board-16 (ALB-16) by portal image verification. Supine positioning (SP) is the most commonly used and the standard tangent set-up for breast radiotherapy. These techniques includes deep inspiration breath hold, accelerated partial-breast irradiation, Intensity Modulated Radiation Therapy. Advanced radiotherapy techniques have been investigated to improve the dose distributions and to reduce toxicities. Purpose: Organs at risk sparing without compromising adequate coverage to the target volumes is the main challenge during left breast cancer adjuvant radiation therapy.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |