ABSTRACT
Objective:To investigate the role of cervical core muscle group exercise and massage in the change of cervical spine curvature during radiotherapy for head and neck tumors and the effect on set-up errors.Methods:A total of 40 patients with head and neck tumours receiving radiotherapy in the First Affiliated Hospital of Air Force Military Medical University from March 2020 to July 2021 were prospectively selected, and all of them underwent different degrees of changes in cervical spine curvature during radiotherapy. The cervical core muscle exercise and manual massage were used to do treatment intervention on the change in the cervical spine curvature. Changes in cervical spine curvature at the time of the curvature change of the cervical spine and at 1 d, 3 d and 5 d after the intervention were observed by using cone beam CT, and then data were recorded in 3 dimensions. The set-up error when cervical spine curvature changed was compared with that after the muscle group exercise and manipulation, and Pearson was used to analyze the linear correlation of set-up errors in each direction.Results:There were 23 males and 17 females, with a median age of 41 years (26-62 years). The significant improvement of cervical curvature at 1 d, 3 d and 5 d after the intervention could be found in 2 cases (5.0%), 20 cases (50.0%) and 39 cases (97.5%). Using the cervical 4 vertebrae as the matching standard, the set-up errors at the time of change in cervical spine curvature and at 1 d, 3 d and 5 d after treatment were (1.3±0.9) mm, (1.2±0.8) mm, (1.3±0.7) mm and (1.3±0.7) mm in the left-right direction respectively; (2.0±0.7) mm, (1.7±0.8) mm, (1.8±0.7) mm and (1.9±0.8) mm in the head-foot direction respectively; (4.9±0.7) mm, (4.6±0.7) mm, (3.4±0.7) mm, (1.7±0.6) mm in the anterior-posterior direction respectively. The set-up error in the anterior-posterior directions at 3 d and 5 d after treatment intervention was lower than that at the time of change in cervical spine curvature and at 1 d after treatment intervention (all P < 0.01), and that at 5 d after treatment intervention was lower than that at 3 d after treatment intervention ( P < 0.01). There were no statistically significant differences between the left-right direction and head-foot direction at each time point (all P > 0.05). There was no correlation between left-right direction and head-foot direction ( r = 0.049, P = 0.540), between left-right direction and anterior-posterior direction ( r = 0.041, P = 0.607), and between head-foot direction and anterior-posterior direction ( r = 0.003, P = 0.931) in terms of set-up errors. Conclusions:Core cervical muscle group training and massage could improve the change in cervical spine curvature, increase the repeatability of the set-up, which provides a favourable guarantee for accurate treatment.
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Objective:To evaluate the effect of image-guided with cone-beam computed tomography (CBCT) based on volumetric modulated arc therapy (VMAT)-flattening filter free (FFF) on the setup errors of stereotactic body radiotherapy (SBRT) in patients with spinal metastatic tumors.Methods:The clinical data of 15 patients with spinal metastatic tumors who underwent SBRT in Jilin Cancer Hospital from August 2020 to January 2022 were retrospectively analyzed. The radiotherapy dose of bone metastasis was 32 Gy per 4 times and CBCT scanning was performed before and after radiotherapy. Every patient received radiotherapy 4 times; all 15 patients underwent SBRT 60 times in total and 120 CBCT volume images were finally obtained and analyzed. The systematic error (Σ) and random error (σ) were calculated at different correction threshold levels. The translational setup error and rotational setup error at the left-right (X axis), head-foot (Y axis) and front-back (Z axis) directions before and after radiotherapy were compared, which were expressed as Σ ± σ.Results:The pre-SBRT and post-SBRT translational setup errors were (0.14±0.27) cm and (0.07±0.19) cm, respectively ( P<0.001) in the X direction, (-0.05±0.33) cm and (0.00±0.19) cm, respectively ( P = 0.001) in the Y direction, (-0.13±0.19) cm and (-0.02±0.14) cm, respectively ( P = 0.012) in the Z direction. The pre-SBRT and post-SBRT rotational setup errors were (-0.31±0.76)° and (-0.09±0.34)°, respectively ( P < 0.001) in the X direction, (-0.13±0.88)° and (-0.07±0.36) °, respectively ( P < 0.001) in the Y direction, (0.10±0.51)° and (0.16±0.38)°, respectively ( P < 0.001) in the Z direction. Conclusions:CBCT correction could reduce Σ and σof the translational setup and rotational setup, increase the accuracy of SBRT based on VMAT-FFF for patients with spinal metastatic tumors.
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RESUMEN Introducción: las radiaciones con fines terapéuticos han revolucionado la medicina y en especial, las tecnologías de radiación para el tratamiento del cáncer. Objetivo: determinar el margen de error de la configuración y el movimiento de órganos en la determinación de la posición del Clinical Target Volumen basadas en la tomografía computarizada de haz cónico de kilovoltaje en el tratamiento al cáncer de próstata, así como cuantificar el movimiento de los órganos durante la terapia conformal de la próstata obtenida un margen para la próstata. Métodos: investigación experimental; se asumió el método radioterápico de la adaptación día a día. Se seleccionaron los pacientes registrados de enero a abril del 2017 de Oncología Radioterápica del Hospital Universitario de la Universidad de Verona en Italia, con adenocarcinoma de próstata en estadios T1 a T4; fueron tratados mediante terapia de arco volumétrico modulado. Resultados: se utilizó la fórmula de Van Herk para encontrar el margen de la próstata, se observó que en la dirección cráneo caudal y lateral existen dispersiones pequeñas, y en la anteroposterior el grado de dispersión es más grande, lo que se relacionó con el llenado rectal, movimiento de la vejiga y peristalsis del paciente. Se encontró que los márgenes requeridos para la próstata entre CTV y PTV serían en la dirección cráneo caudal 3,3 mm, lateral 3,7 mm y anteroposterior 4,4mm. Conclusiones: la tomografía computarizada de haz cónico es una herramienta precisa para la guía de imágenes, proporciona un medio equivalente de corrección de la configuración para pacientes de próstata.
ABSTRACT Introduction: radiations with therapeutic aims have revolutionized medicine, particularly radiation technologies for the treatment of cancer. Objective: to determine the margin of errors of the configuration and the movement of organs in determining the position of Clinical Target Volume using kilovoltage cone-beam computed tomography in the treatment of prostate cancer, as well as to quantify the movement of organs during the planned therapy of prostate obtained by a margin for the prostate. Methods: an experimental research, the radio-therapeutic method on a day-to day basis was taken on. Patients registered from January to April 2017 on Cancer Radiotherapy from the University Hospital of Verona University in Italy, with prostate adenocarcinoma stages T1 to T4; and who were treated using volumetric modulated arch therapy. Results: making use of Van Herk's formula to position the margin of prostate, it was observed that in the craniocaudal and lateral direction there are small scatterings, and in the anteroposterior direction the degree of scattering is greater, being related to rectal filling, bladder movement and peristalsis of the patient. Finding the required margins for the prostate between CTV and PTV would be in the craniocaudal direction 3,3 mm, lateral 3,7 mm and anteroposterior 4,4 mm. Conclusions: cone-beam computed tomography is a precise tool to guide the images; it provides an equivalent approach of correction of the configuration for prostate cancer patients.