A 3D-printed phantom for stereotactic body radiation therapy simulation.

In modern radiation therapy for lung cancer, examining the uncertainty between tumor motion and beam delivery is vitally important. To lower the radiation dose delivery to the patient's normal tissue, narrowing the irradiation field margin to hit the tumor accurately is critical. Thus we proposed a phantom that simulates the thorax and lung tumor's motions by employing a 3D printing technique. The lung tumor is controlled by a linear miniature Delta robot arm, with a maximum displacement of 20 mm in each direction. When we simulated the thoracic breathing movements at 12 mm in A-P (Anterior-Posterior), the control errors were within 10%. The average tracking errors of the prosthetic tumor were within 1.1 mm. Therefore, the 3D-printed phantom with a robot arm can provide a reliable simulation for training and dosimetry measurement before lung radiotherapy, especially SBRT.

Factors associated with 14-day hospital readmission in frail older patients: A case-control study.

Frailty is a key predictor of readmission among older patients. However, studies on the factors associated with readmission of frail older patients are lacking. This study aims to examine factors associated with 14-day hospital readmission in frail older patients. A retrospective case-control study was conducted. Patients were eligible for inclusion if they were age 65 and over and if their Clinical Frailty Scale (CFS) score was above 4. A total of 210 frail older patients were included. Patients who had partners, experienced a fall within 6 months before hospitalization, had pressure injuries, received surgery or chemotherapy, and received rehabilitation therapy from a physical therapist during hospitalization had increased odds of being readmitted to the hospital within 14 days. Moreover, patients receiving comprehensive geriatric assessment (CGA) services during hospitalization showed a significantly reduced risk of readmission. Adapting CGA and developing continuity care plans from hospitals to the community are crucial.