Pengukuran Nilai CT Number Pada Phantom CIRS 062m Sebagai Data Input Kalkulasi Dosis Program ISIS 3d Di Treatment Planning System

Authors

  • Purwantiningsi Purwantiningsi Program Studi Fisika, Universitas Nasional
  • Hadi Lesmana Program Studi Fisika, Universitas Nasional

DOI:

https://doi.org/10.47313/jig.v17i2.541

Keywords:

CT number, Densitas Elektron, kurva DVH

Abstract

Telah dilakukan pengukuran nilai CT number pada pesawat CT Scan Simulator
General Elektrik di RSPAD Gatot Soebroto Jakarta dengan menggunakan phanthom CIRS
062 dengan berbagai variasi nilai jaringan ( lung inhale, lung exhale, adipose, breast, water,
muscle, liver, bone 200, bone 800 ), dilakukan scanning phantom dengan ketebalan slices
10 mm, kV 100, mAs 190. Pengukuran CT number dilakukan dengan memberi tanda
lingkaran pada setiap objek jaringan dengan diameter lingkaran Region Of Interest (ROI)
yang sama, maka didapatkan hasil CT number ( Lung inhale ; -800.9, Lung exhale ; -492.1,
Adipose ; -66.8, Breast ; -30.2, Water ; -7.7, Muscle ; 47.5, Liver ; 56.2, Bone 200 ; 255.3,
bone 800 ; 929 ). Hasil nilai pengukuran CT number jaringan di input kedalam program iSis
3D yang terdapat di TPS (Treatment Planning Sistem). Hasil kalkulasi dosis dilakukan
menggunakan sampel planning pada organ paru pada program iSis 3D dengan
menggunakan energi elektron 8 MeV dan didapatkan hasil perbedaan sebelum dan sesudah
dimasukan nilai densitas elektron dalam kurva DVH (dose volume histogram). hasil yang
didapat dari bacaan kurva DVH antara sebelum dan sesudah dimasukan nilai densitas
menyatakan bahwa selisih perbedaan pada daerah jaringan paru sebelah kanan akumulasi
dosis rata-rata (Dmean) 3.6 % pada volume 2080 cm3, pada daerah jaringan paru sebelah
kiri dosis rata-rata (Dmean) 2.4% pada volume 1271 cm3, dan pada organ jantung dosis
rata-rata (Dmean) 1,36% pada volume 199,4 cm3.

References

Shusterman, A.J, Shusterman, G.P (1977). Teaching Chemistry with Elektron Density Models, The Journal of Chemical Education.

Podgorsak, E.B. (2003). IAEA publishing Review Radiation Oncology Physics

IAEA-TECDOC-1583 Commissioning of Radiotherapy Treatment Planning Systems, Testing for Typical External Beam Treatment Techniques

John, H.E, Cunningham, J.R., Charles C thomas (1983) The Physics of Radiology 4th Edition Publisher.

AAPM Radiation Therapy Quality assurance for computed tomography simulator and the computed tomography simulation process : Report of the Comitte No. 66, American Association of Physicists in Medicine. 2003

Sprawls, P. Jr., “Physical Principles of Medical Imaging”, second edition, Aspen

Publisher, USA, 1995

www.cirsinc.com, 3 Maret 2014.

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Published

2019-03-20

Issue

Vol. 17 No. 2 (2014): Volume 17 Edisi 2 Tahun 2014

Section

Articles

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