scholarly journals Comparison of the dosimetric accuracy of proton breast treatment plans delivered with SGRT and CBCT setups

2021 ◽  
Author(s):  
Michael J. MacFarlane ◽  
Kai Jiang ◽  
Michelle Mundis ◽  
Elizabeth Nichols ◽  
Arun Gopal ◽  
...  
Keyword(s):  
Dosimetric Accuracy ◽  
Treatment Plans

scholarly journals The influence of errors in small field dosimetry on the dosimetric accuracy of treatment plans

2019 ◽  
Vol 59 (5) ◽  
pp. 511-517 ◽  
Author(s):  
Wolfgang Lechner ◽  
Alexander Primeßnig ◽  
Lena Nenoff ◽  
Paulina Wesolowska ◽  
Joanna Izewska ◽  
...  
Keyword(s):  
Small Field ◽  
Small Field Dosimetry ◽  
Dosimetric Accuracy ◽  
Treatment Plans

Evaluation of the user-friendliness and dosimetric accuracy of treatment planning systems for 3-dimensional conformal radiotherapy

2002 ◽  
Vol 3 (1) ◽  
pp. 33-41
Author(s):  
V. W. C. Wu ◽  
K. Y. Cheung ◽  
L. Lee ◽  
S. Y. Tung ◽  
J. Leung ◽  
...  
Keyword(s):  
Treatment Planning ◽  
Calculated Data ◽  
Conformal Radiotherapy ◽  
Planning Systems ◽  
User Friendliness ◽  
3 Dimensional ◽  
Treatment Planning Systems ◽  
Dosimetric Accuracy ◽  
Treatment Plans ◽  
Set Up

Purpose: The purpose of this study is to compare the performance of three 3-dimensional radiotherapy treatment planning systems (TPS) in terms of user-friendliness and dosimetric accuracy.Methods: A scale type questionnaire, which contained 129 items under 13 aspects of the TPS, was used to collect opinions from users from three different institutions with regards to the user-friendliness. The assessment of dosimetric accuracy was carried out by comparing the measured dose values with those calculated by the TPS under 18 different irradiating and phantom set-up conditions.Results: Eleven respondents completed the questionnaires for each TPS. Our study indicated that the Varian CadPlan was outstanding in the plotting and network transfer of treatment plans to other workstations, the CMS Focus performed better in the construction of treatment aids, and the ADAC Pinnacle in the outlining, modification of field parameters, control of graphics and normalization of dose. In terms of dosimetric accuracy, the measured and the calculated data for the 3 TPSs showed fairly good agreement. Except for the field with median block, in which the Focus presented with the best result, the differences in other irradiating conditions were not obvious with the percentage dose deviations within ±3%.Conclusion: In conclusion, for the 3 TPSs evaluated, each had its own strengths and weaknesses, and no TPS was superior in all test conditions.

scholarly journals Dosimetric Evaluation of the QFix kVueTM Calypso Couch Top

2021 ◽  
Vol 20 ◽  
pp. 153303382110119
Author(s):  
Lingtong Hou ◽  
Huiqin Zhang ◽  
Xiaomei Sun ◽  
Qianqian Liu ◽  
Tingfeng Chen ◽  
...  
Keyword(s):  
Treatment Plan ◽  
Field Size ◽  
Planning System ◽  
Treatment Planning System ◽  
The Real ◽  
Depth Dose ◽  
Dosimetric Accuracy ◽  
Treatment Plans ◽  
The Difference ◽  
A Minor

Purpose: To evaluate the dosimetric accuracy of the default couch model of the QFix kVueTM Calypso couch top in the treatment planning system. Methods: With the gantry 180°, field size 20 × 20 cm, 6 MV, we measured the depth dose, off-axis dose, and dose plane of different depths in the phantom with the couch rails in and out, respectively. Isocenter doses at different angles were also obtained. The results were compared to the doses calculated using the default couch top model and the real scanned couch top model. Then we revised the default model according to the measured results. Results: With “Rails In,” the depth dose, off-axis dose, and dose plane of the default couch top model had a big difference with the dose of the real scanned couch top model and the measured result. The dose of the real scanned couch top model was much closer to the measured result, but in the region of the rail edge, the difference was still significant. With “Rails Out,” there was a minor difference between the measured result, the dose of the default couch top model and the real scanned couch top model. The difference between the measurement and the default couch top model became very small after being revised. Conclusions: It is better to avoid the beam angle passing through the couch rails in treatment plans, or you should revise the parameter of the QFix kVueTM Calypso couch top model based on the measured results, and verify the treatment plan before clinical practice.

PO-1650 Investigating dosimetric accuracy of SRS treatment plans for brain metastases

2021 ◽  
Vol 161 ◽  
pp. S1369-S1370
Author(s):  
G. Mok ◽  
J.H. Phua ◽  
H.Q. Tan ◽  
K.W. Ang ◽  
S.Y. Park ◽  
...  
Keyword(s):  
Brain Metastases ◽  
Dosimetric Accuracy ◽  
Treatment Plans

Aumento de coroa estética sem elevação de retalho – abordagem minimamente invasiva

2020 ◽  
Vol 12 (45) ◽  
pp. 34-39
Author(s):  
Flavia Sukekava ◽  
Julia Helena Luiz ◽  
Paloma Palma ◽  
Jaques Luiz
Keyword(s):  
Minimally Invasive ◽  
Correct Diagnosis ◽  
Case Series ◽  
Minimally Invasive Techniques ◽  
Bone Removal ◽  
Use Of Technology ◽  
Treatment Plans ◽  
Invasive Techniques ◽  
Crown Lengthening ◽  
Gummy Smile

Gummy smile is a characteristic in which the patient exposes more than 2 mm of keratinized gingiva in forced smile. With a multifactorial cause, its correct planning depends directly on the correct diagnosis. Usually, the procedures that involve manipulation and the enlargement of the aesthetical crown lengthening are surgical. The objective of this case series was to show the advantages of surgical crown augmentation surgery in aesthetic areas with minimally invasive techniques. Three cases of gummy smile were presented, with different treatment plans and techniques for execution. In the 3 cases, bone removal was performed with piezoelectric ultrasound, which made the postoperative more comfortable for patients. These cases illustrate the use of technology to reduce morbidity in patients who need to undergo bone removal to treat gingival smile.

Comparison between different boost dose delivery techniques to the tumor bed of right sided breast cancer patients.

2017 ◽  
Vol 13 (1) ◽  
pp. 4605-4617
Author(s):  
Aly Mahmoud El-Hdidy
Keyword(s):  
Breast Cancer ◽  
Cancer Patients ◽  
Target Location ◽  
Breast Cancer Patients ◽  
Photon Beams ◽  
Lung Dose ◽  
Dose Volume Histograms ◽  
Tumor Bed ◽  
Boost Dose ◽  
Treatment Plans

Comparisons between three different techniques by which the boost dose was delivered to the tumor bed were carried out , aiming to present the best technique of treatment for right breast cancer patients.In this study, ten right sided breast cancer computed tomography (CT) scans were selected for ten early right breast cancer patients. We made three different treatment plans for each patient CT using three different irradiation techniques to deliver a prescribed boost dose of 10 Gy in 5 fractions to the boost PTV. In the first technique, two tangential photon beams were used, in the second technique we, two oblique photon beams were used and in the third technique, a single electron beam was used. The comparative analyses between the three techniques were performed by comparing the boost PTV- dose volume histograms (DVHs), the ipsilateral breast (right breast) DVHs, the ipsilateral lung (right lung) DVHs and the heart DVHs of the three techniques for each patient. Furthermore the dose that covering 100% , 95% of the volume (D100% , D95%) and the volume covered by 95% of the dose (V95%)of  the boost PTV of all techniques, were calculated for each patient to investigate the dose coverage of the target.Results showed that there were variations of the dose received by tumor bed, right breast and OARs depending on the technique used and the target location and size. A decrease of D100% than 90% of the prescribed dose was observed with the 3rd technique for patients 8, 9 and 10, and was observed with the 2nd technique for patient 5. A reduction of right breast dose was observed when the 3rd technique was use in comparison with the 1st and the 2nd techniques for patients 1, 2, 3, 4, 6 and 8.  Also reduction of right breast was observed when the 2nd technique used in comparison with 1st technique. An increase of lung dose was observed with the 3rd technique for patients 1, 2, 5 and 6, also was observed with 2nd technique in patient 3, 5 and 7. A decrease of lung dose was observed with the 1st technique for patients 2, 4, 5, 6, 7, 8 and 9An individualized treatment, several plans using different irradiation techniques should be developed for each patient individually to reach the best boost PTV dose coverage with minimal OARs’ dose. 

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