Abstract
Purpose: The goal of this study is to develop data correction schemes for a small field of view (SFOV) high resolution gamma camera detector for a small organ dedicated system such as breast, thyroid and joints. Methods: The gamma camera contains PMTs coupled with single slap of NaI(TI) plate crystal. Correction schemes including energy, linearity and uniformity correction were developed. Energy and linearity correction was performed with 57Co sheet by utilizing same dot pattern phantom used for look up table (LUT) generation. Energy correction aligns the energy peaks of energy spectrum to reference energy by linear transformation. Linearity correction removes spatial distortions based on LUT of X, Y directions. Uniformity correction was executed with 99mTc flood source to redistribute counts in the image. This correction was based on pixel addition and subtraction for each event. Results: The results showed calibration measure for dot pattern image acquired with 57Co sheet and flood field image obtained with 99mTc. This system acquired with 99mTc provided 17. 54% FWHM energy resolution and 2. 5% integral uniformity within a useful field of view (UFOV). Conclusions: The correction schemes in this paper showed good results about linearity and uniformity. The measured energy resolution of the system is not as high as what we had expected due to the limitation of the current version of DAQ in the prototype system. In the future, we will revise the hardware so that we can maximize the performance of the proposed methods.
| Original language | English |
|---|---|
| Pages (from-to) | 215-222 |
| Number of pages | 8 |
| Journal | Biomedical Engineering Letters |
| Volume | 2 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2012 Dec 1 |
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Keywords
- Calibration
- Cubic spline interpolation
- Energy correction
- Gamma camera
- Linearity correction
ASJC Scopus subject areas
- Biomedical Engineering
Cite this
Development of correction schemes for a small field of view gamma camera. / Hung, Nguyen Manh; Joung, Jinhun; Lee, Kisung; Kim, Yongkwon.
In: Biomedical Engineering Letters, Vol. 2, No. 4, 01.12.2012, p. 215-222.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Development of correction schemes for a small field of view gamma camera
AU - Hung, Nguyen Manh
AU - Joung, Jinhun
AU - Lee, Kisung
AU - Kim, Yongkwon
PY - 2012/12/1
Y1 - 2012/12/1
N2 - Purpose: The goal of this study is to develop data correction schemes for a small field of view (SFOV) high resolution gamma camera detector for a small organ dedicated system such as breast, thyroid and joints. Methods: The gamma camera contains PMTs coupled with single slap of NaI(TI) plate crystal. Correction schemes including energy, linearity and uniformity correction were developed. Energy and linearity correction was performed with 57Co sheet by utilizing same dot pattern phantom used for look up table (LUT) generation. Energy correction aligns the energy peaks of energy spectrum to reference energy by linear transformation. Linearity correction removes spatial distortions based on LUT of X, Y directions. Uniformity correction was executed with 99mTc flood source to redistribute counts in the image. This correction was based on pixel addition and subtraction for each event. Results: The results showed calibration measure for dot pattern image acquired with 57Co sheet and flood field image obtained with 99mTc. This system acquired with 99mTc provided 17. 54% FWHM energy resolution and 2. 5% integral uniformity within a useful field of view (UFOV). Conclusions: The correction schemes in this paper showed good results about linearity and uniformity. The measured energy resolution of the system is not as high as what we had expected due to the limitation of the current version of DAQ in the prototype system. In the future, we will revise the hardware so that we can maximize the performance of the proposed methods.
AB - Purpose: The goal of this study is to develop data correction schemes for a small field of view (SFOV) high resolution gamma camera detector for a small organ dedicated system such as breast, thyroid and joints. Methods: The gamma camera contains PMTs coupled with single slap of NaI(TI) plate crystal. Correction schemes including energy, linearity and uniformity correction were developed. Energy and linearity correction was performed with 57Co sheet by utilizing same dot pattern phantom used for look up table (LUT) generation. Energy correction aligns the energy peaks of energy spectrum to reference energy by linear transformation. Linearity correction removes spatial distortions based on LUT of X, Y directions. Uniformity correction was executed with 99mTc flood source to redistribute counts in the image. This correction was based on pixel addition and subtraction for each event. Results: The results showed calibration measure for dot pattern image acquired with 57Co sheet and flood field image obtained with 99mTc. This system acquired with 99mTc provided 17. 54% FWHM energy resolution and 2. 5% integral uniformity within a useful field of view (UFOV). Conclusions: The correction schemes in this paper showed good results about linearity and uniformity. The measured energy resolution of the system is not as high as what we had expected due to the limitation of the current version of DAQ in the prototype system. In the future, we will revise the hardware so that we can maximize the performance of the proposed methods.
KW - Calibration
KW - Cubic spline interpolation
KW - Energy correction
KW - Gamma camera
KW - Linearity correction
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U2 - 10.1007/s13534-012-0074-7
DO - 10.1007/s13534-012-0074-7
M3 - Article
VL - 2
SP - 215
EP - 222
JO - Biomedical Engineering Letters
JF - Biomedical Engineering Letters
SN - 2093-9868
IS - 4
ER -