Dosimetric characteristic is one of the essential parameters of a medical linear accelerator (LINAC), which must be obtained before clinical use. The dosimetric characteristics for 6 MV photon beam were measured and c...Dosimetric characteristic is one of the essential parameters of a medical linear accelerator (LINAC), which must be obtained before clinical use. The dosimetric characteristics for 6 MV photon beam were measured and compared with the corresponding published data. The study was done using a Varian linear accelerator (Model Clinac-iX) at the Institute of Nuclear Medical Physics (INMP), AERE, Savar, Dhaka, under the Bangladesh Atomic Energy Commission (BAEC). The data is taken for 10 field sizes (2 × 2, 3 × 3, 5 × 5, 7 × 7, 10 × 10, 15 × 15, 20 × 20, 25 × 25, 30 × 30 and 40 × 40 cm<sup>2</sup>) at same conditions. The measured Percent Depth Dose (PDD) curves were obtained for 6 MV photon beams with the field as mentioned above and compared with the calculated PDD curves. The measured depth dose (D<sub>max</sub>) for reference field size (FS) 10 × 10 cm<sup>2</sup> is 15.99 mm, and the PDD at 10 cm depth (D<sub>10</sub>) is 66.87% for 6 MV photon energies that are found to be compatible with the published report BJR supplement 25. The measured PDD curves for photon energies show a good agreement with the standard PDD curves. The photon beam dosimetry data found in the current study are compatible and all the tolerances are within the clinically acceptable tolerance limit.展开更多
Right coronary artery (RCA) communicating to coronary sinus (CS) resulting in aneurysmal dilatation of RCA is a rare congenital anomaly, usually presenting late with complication of left to right shunt and volume over...Right coronary artery (RCA) communicating to coronary sinus (CS) resulting in aneurysmal dilatation of RCA is a rare congenital anomaly, usually presenting late with complication of left to right shunt and volume overload. We report a case of a 53 years old female presenting with dyspnea on exertion, orthopnea and angina. Echocardiography and computed tomography are suggestive of a fistulous communication of RCA to CS with aneurysm of RCA. Patient was treated surgically and is asymptomatic after three years of follow up.展开更多
Neurofibroma arising from intrathoracic vagus nerve is a rare entity. We present a 6-year-old child with stigmata of neurofibromatosis along with a lump in the back. She also had history of on and off cough. On invest...Neurofibroma arising from intrathoracic vagus nerve is a rare entity. We present a 6-year-old child with stigmata of neurofibromatosis along with a lump in the back. She also had history of on and off cough. On investigation there was a large mediastinal mass abutting the trachea. She underwent a posterolateral thoracotomy with partial resection of the lump. Intraoperatively the mass appeared to arise from the vagus nerve. Post operative stay was uneventful. Biopsy of the mass revealed a benign neurofibroma with no evidence of invasion. She is presently asymptomatic after 1 year of follow-up.展开更多
文摘Dosimetric characteristic is one of the essential parameters of a medical linear accelerator (LINAC), which must be obtained before clinical use. The dosimetric characteristics for 6 MV photon beam were measured and compared with the corresponding published data. The study was done using a Varian linear accelerator (Model Clinac-iX) at the Institute of Nuclear Medical Physics (INMP), AERE, Savar, Dhaka, under the Bangladesh Atomic Energy Commission (BAEC). The data is taken for 10 field sizes (2 × 2, 3 × 3, 5 × 5, 7 × 7, 10 × 10, 15 × 15, 20 × 20, 25 × 25, 30 × 30 and 40 × 40 cm<sup>2</sup>) at same conditions. The measured Percent Depth Dose (PDD) curves were obtained for 6 MV photon beams with the field as mentioned above and compared with the calculated PDD curves. The measured depth dose (D<sub>max</sub>) for reference field size (FS) 10 × 10 cm<sup>2</sup> is 15.99 mm, and the PDD at 10 cm depth (D<sub>10</sub>) is 66.87% for 6 MV photon energies that are found to be compatible with the published report BJR supplement 25. The measured PDD curves for photon energies show a good agreement with the standard PDD curves. The photon beam dosimetry data found in the current study are compatible and all the tolerances are within the clinically acceptable tolerance limit.
文摘Right coronary artery (RCA) communicating to coronary sinus (CS) resulting in aneurysmal dilatation of RCA is a rare congenital anomaly, usually presenting late with complication of left to right shunt and volume overload. We report a case of a 53 years old female presenting with dyspnea on exertion, orthopnea and angina. Echocardiography and computed tomography are suggestive of a fistulous communication of RCA to CS with aneurysm of RCA. Patient was treated surgically and is asymptomatic after three years of follow up.
文摘Neurofibroma arising from intrathoracic vagus nerve is a rare entity. We present a 6-year-old child with stigmata of neurofibromatosis along with a lump in the back. She also had history of on and off cough. On investigation there was a large mediastinal mass abutting the trachea. She underwent a posterolateral thoracotomy with partial resection of the lump. Intraoperatively the mass appeared to arise from the vagus nerve. Post operative stay was uneventful. Biopsy of the mass revealed a benign neurofibroma with no evidence of invasion. She is presently asymptomatic after 1 year of follow-up.
