WP2: Protocollo, Gestione esame, Adeguamento Facility SYRMA CT/3D WP2: Protocollo, Gestione esame, Adeguamento Facility Aspetti tecnici

Layout Safety elements Control elements BEAM PREPARATION Vacuum slits Monochromator Al filters Air Slits Beam stopper Fast shutters Ionization chambers BEAM Mammographic station BEAM PREPARATION Energy, flux, geometry BEAM MONITORING Dose, exposure time Safety system PATIENT EXPOSURE Safety elements Control elements Patient Slits PIXIRAD 3

RIDONDANZA SAFETY SHUTTER 1 IONIZATION CHAMBER B CHAMBER A IMAGING 4

DIVERSIFICAZIONE

SISTEMI

DEFINIZIONE FASCIO

Supporto paziente Rotation for projection selection and tomography Horizontal adjustment Vertical scanning Rotation for projection selection and tomography : ±Nx360° v : ?-60 °/s Resolution < 1° y : 20 cm vy : 0.5 - 4 cm/s Stability vy : 1% Resolution : ~100 m x : 40 cm Resolution : ~1mm vx : 5 cm/s Rotation 8

PACS Flat Field CPU & I/O It determines access conditions to the patient hutch Based on Pilz PS 3000 PLC with high safety standard Operating modes: experiment and patient Experiment mode (i.e. standard beamline: door locked, standard search procedure required to open beamstoppers, etc.) Patient mode: ‘Radiologist’ key inserted, door unlocked, modified search inspection) CPU & I/O Flat Field

Protocollo: scelta energia Ghiandolarita’ (posizione) SISTEMA DI RITENZIONE ENERGIA 10

Protocollo: scansione Rotazione continua a velocita’ cost 1 2 3 4 n Fenditura PIXIRAD I O C 1 2 SHa 11

Protocollo: scansione Velocita’ bed Traslazione Y bed Shutter Trigger PIXIRAD Esempio quantitativo: max FPS Pixirad = 30  per 600 proiezioni ci vogliono 20 s Ip: 5 s per traslazione Y 25 s totali per fetta altezza fascio 2.5 mm e 37.5 mm di regione di scansione  15 fette Tempo totale esame > 375 s 12

Detector Pixirad 512x476 pixel/modulo x 8 moduli x 2 byte  3.9 x 106 B/frame 30 FPS 117x106 B/s (assai vicino al limite teorico della BW della Gigabit Ethernet) 600 proiezioni, 15 fette  > 35 x 109 B/esame SHMI Gigabit ethernet Data, Control PIXIRAD Storage Computing Ethernet Visualization Trigger PS Chiller

The Dose Control System (DCS) It operates in patient mode Aims: to prevent over-exposure to the patient to monitor the correct working conditions of all the components before and during a scan Alarm states: Malfunction of dose monitors Malfunction of Detector Mismatch of monochromator energy Overcome of skin doserate threshold Overcome of integrated dose threshold Actions: Abort of exam: closure of safety and imaging shutters Acoustic alarm 14