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 Rooms Layout Rooms Dimension Network/ Internet Integration Radiation Protection Environment Statics Power Supply Page 5

6 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 6

7 Static/ Floor Mounted [MANUFACTURE] Floor construction should be solid and free from vibration ( C 20/25 C 50/60) Fastening gantry to floor Floor and building vibration (less than 0.5 m/ s 2 ) PointA Point B Point C Point D 4.6 kn 6.85 kn 5.5 kn 4.6 kn Page 7

8 Radiation Protection Equipments Type Number of X Ray Tube Positioning Equipments Usage/ Workload Sorrounding Area Page 8

9 Shielding Calculation [IAEA] Kerma Detector (K 0 ) Kerma Detector (K x ) K B = x K 0 Barrier Page 9

10 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 K B = x K 1 d 2 N Page 10

11 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 11

12 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 12

13 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 CTbody DLP body head K ( mgy) = 1.2 k DLP body Page 13

14 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 14

15 Shielding Calculation [IAEA] K head ( cm ) 1200mGycm = 0. mgy 1 CT ( mgy) = 108 K body CT = 1.2 (3 10 cm ) 500mGycm = mgy K 1 Tot ( mgy) = 0.108mGy 120 = CThead K 1 Tot body mgy ( mgy) = 0.18mGy 80 = 14. 4mGy CT Page 15

16 Shielding Calculation [IAEA] 1 K Total ( mgy) = 12.96mGy mGy = mGy 27.36mGy K0 = = 3. 04mGy 2 3 m B P/ T 0.01 = = = K Page 16

17 Shielding Calculation [IAEA] B = Page 17

18 Shielding Calculation [Manufacture/ Scatter] Page 18

19 Environment [MANUFACTURE] Rooms Temperature C Relative Humidity 50 60% without condensation Pressure hpa Sufficient Lightning, controllable if possible (depend on procedures). Page 19

20 Temperature and relative humidity Temperature: derajat celcius. Relative Humidity: % Page 20

21 Power Supply [MANUFACTURE] SOMATOM Scope SOMATOM Go SOMATOM Perspective SOMATOM Definition AS SOMATOM Definition Edge SOMATOM Definition Flash SOMATOM Force 70 kva 100 kva 150 kva On/Off Button. Two emergency Switch in operator and examination rooms. Page 21

22 Network/ Internet [MANUFACTURE] Broadband connection and router TCP/ IP address for individual machine Page 22

23 CONCLUSION Radiation Protection Medical Physicist Regulations Manufacture BAPETEN IAEA Networks/ Internet Statics Environment Power Supply Radiation Protection (Shielding) Rooms Dimension Rooms Requirements Page 23

24 REFERENCES National Council on Radiation Protection and Measurements, Report No. 147, Structural Shielding Design for Medical X-Ray Imaging Facilities Bethesda, MD Page 24

25 Now s our time to inspire the future of healthcare together 5/3/2017 Page 25 Engineering success. Pioneering healthcare.