Proposed Room Requirements for CT System

Transcription

1 Siemens Proposed Room Requirements for CT System Semarang, 4-5 May 2017 Restricted Siemens Healthcare GmbH, 2016 Page 1

2 Roles of Medical Physicist CT Image Quality Radiation Protection Optimization Medical Physicist Quality Control Page 2

3 Shielding Purpose Radiation Protection Regulation/ Authorization Page 3

4 Rules/ Requirements International Atomic Energy Agency [ IAEA] BAPETEN No. 8/ 2011 Manufacture Specification Page 4

5 Concept Consideration Equipments Type Number of X Ray Tube Positioning Equipments Usage/ Workload Sorrounding Area Page 5

6 Shielding Calculation [IAEA] Kerma Detector (K 0 ) Kerma Detector (K x ) B = K x K 0 Barrier Page 6

7 Shielding Calculation [IAEA] d = 1 m Kerma Detector (K 1 ) Distance (d) Kerma Detector (K 0 ) K = 0 K d 1 2 if N patients was perform K 0 = K 1 d 2 N B = K K x 1 d 2 N Page 7

8 Shielding Calculation [IAEA] P : Weekly permited kerma in the occupied area 25% of NBD for Radiation officer (5 msv/yr = 0.1 msv/wk) Should only use in controled area T : Fraction of the beam-on time a shielded area is occupied by an individual Page 8

9 Shielding Calculation [IAEA] P : Weekly permited kerma in the occupied area 25% of NBD for Radiation officer (5 msv/yr = 0.1 msv/wk) Should only use in controled area T : Fraction of the beam-on time a shielded area is occupied by an individual Page 9

10 Shielding Calculation [IAEA] Computed tomography (CT) scanners will generate scatter and leakage radiation to the environs of the room. For every 10 mm of x-ray beam width, the intensity of this secondary radiation at 1 m is a fraction, k, of the peripheral CTDI100. Head scans: k = cm -1 Body scans: k = cm- 1 K ( mgy) = k 1 CT head 1 CT body DLP body head K ( mgy) = 1.2 k DLP body Page 10

11 Shielding Calculation [IAEA] Example Case : Considered a barrier for operator scanner room if, P = 0.01 mgy/ wk, T = 1, distance between CT Scan gantry to operator room 3 m. There is 200 patients in a week, with 120 / 80 for Head and Abdomen. DLP for Head = 1200 mgy and abdomen = 500mGy Page 11

12 Shielding Calculation [IAEA] ( cm ) 1200mGycm = 0. mgy 1 K CT head ( mgy) = K CT body = 1.2 (3 10 cm ) 500mGy cm = mgy K 1 Tot head ( mgy) = 0.108mGy 120 = mGy CT K 1 Tot body ( mgy) = 0.18mGy 80 = 14. 4mGy CT Page 12

13 Shielding Calculation [IAEA] 1 K Total ( mgy ) = 12.96mGy mGy = mGy 27.36mGy K 0 = = 3. 04mGy 2 3 m B P / T 0.01 = = = K Page 13

14 Shielding Calculation [IAEA] B = Page 14

15 Shielding Calculation [Manufacture/ Scatter] Page 15

16 Rooms Dimension [BAPETEN] Recommendation BAPETEN Manufacture Rooms Height : 2,8m (Bapeten) Room Size min. 17,6m 2 Recommendation : Length 6 x width 4 x height 2,8 m Operator room : 2,5m x 4 m (table 90 cm x 120 cm) Wall : Brick (25 cm), Concrete (20 cm with 2.2 g/cm 3 density) or equivalent with 2mm Pb Page 16

17 Gantry Floor Load [Manufacture] Page 17

18 Electrical Panel On/Off Button. Two emergency Switch in operator and examination rooms. Page 18

19 Cable Lead-In and Duct Page 19

20 Dimensions, Weights, Noise Levels, Air Flows, Heat Dissipation Page 20

21 Temperature and relative humidity Temperature: derajat celcius. Relative Humidity: % Page 21

22 Power Consumption 380V 3~phase; 80A fusing; 200mΩ. 380V 3~phase; 125A fusing; 115mΩ. Page 22

23 Now s our time to inspire the future of healthcare together 4/28/2017 Page 23 Engineering success. Pioneering healthcare.