Tabel QC CT Scan [PDF]

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Tabel 1. Program Quality Control Manual CT Scan (Standar ACR) PROCEDURE Water CT number and standard deviation Artefact evaluation



BATAS TOLERANSI



ALAT UKUR



Nilai HU air 0 ± 5 HU, but must be 0 ± 7 HU. >3 HU diantara artefak berati CT number (dalam ring atau lingkaran)



ACR CT Phantom



Wet laser printer quality control -



Visual cheklist



Tidak ada toleransi, apabila terjadi malfungsi harus segera dilaporkan untuk dibenarkan



DURA SI TES (min) 5



RESPONSIBLE



FREQUENCY MINIMUM



Radiografer



Daily



ACR CT phantom



5 or less



Radiografer



Daily



 Densitomet er  Laser film QC chart  SMPTE test pattern Meliputi :



10



Radiografer



Weekly (jika digunakan untuk alat interpretasi utama)



5



Radiografer



Monthly



 Table height indicator functioning  Table position indicator functioning Angulation indicator functioning  Laser localization light functioning  High-voltage cable/other cables safely attached (and not frayed)  X-ray on indicator functioning  Exposure switch functionin  Display window width/level



Dry laser printer quality control -



Display monitor quality control



-



 Densitomet er  Laser film QC chart  SMPTE test pattern SMPTE test pattern or equivalent



10



Radiografer



Monthly (jika digunakan untuk alat interpretasi utama)



5



Radiografer



Monthly



Tabel 2. Program Quality Control CT Scan PARAMETER OR PROCEDURE CT alignment light (IAEA)



CT alignment light



±5 mm



Phantom CT radiografer standar



CT number accuray, image noise, uniformity, artefact (IAEA)



CT number accuracy, image noise, uniformity, artefact



±5 mm from baseline value (ct number accuracy) ±25% of baseline value (image noise) ±10 (uniformity)



water filled test object (or phantom containing a uniform material)



Radiografer + Annually fisikawan medis (phantom head



 Dosimeter Phantom CT dose



Fisikawan medis



Radiation dose (IAEA)



PARAMETER



Radiation dose



BATAS TOLERANSI



No artefacts that have the potential to compromise diagnostic confidence (artefact)  Dose Calculation in Air : Output at every kVp ±5% from baseline  CTDIvol for clinical protocols : Less than Dose Reference Level  Verify scanner CTDIvol :



ALAT UKUR



 Calibrated electromet er and CTDI pencil ionization chamber (10- or 15cm long)  16-cm (head) CTDI



RESPONSIBLE



FREQUENCY MINIMUM Monthly



and body)



Uji penerimaan Anually Setelah perbaikan



±10%



dosimetry phantom  32-cm (adult body) CTDI dosimetry phantom



kVp and HVL (IAEA)



kVp and HVL



Image Noise



Image Noise



kVp ±5 Detektor nominal HVL >= spesifikasi sesuai regulasi batas toleransi ±25 of baseline phantom



X-ray Beam Width (IAEA)



X-ray Beam Width



Spesifikasi manufacture Within 3mm or 30% of Applied Colimator



Image Slice Width (IAEA)



Image Slice Width



High contrast Spatial resolusi



High Contrast Spatial Resolution



Low contrast resolution (IAEA)



Low Contrast resolution



±0,5 mm for = 5 mm variasi ±1 mm.