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KMID : 0667719890260000591
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Report Natlonal Institute of Health
1989 Volume.26 No. 0 p.591 ~ p.645
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Study on Quality Control of Computed Tomography Equipment
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äÌßÂÌß/Ahn, Sang Kyung
ÌÔÎÃúé/ÑÑúÓñº/ä¡â³ÌÏ/áæ÷Êâè/õËû³â×/ÑÑçµüµ/Kyong, Kwang Hyon/Kim, Hyeog Ju/Shim, Soo Kyong/Song, Taeg Soon/Choi, Heoi Suk/Kim, Young Hwan
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Abstract
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Following the study on the utilization of computed tomography equipments in 1987, a study on quality control of CT equipments was taken in this year. This study was conduced to find out the results of performance testing as current status of quality control of CT equipments throughout the country.
In this study we surveyed total numbers of 40 equipments, as it were, 12 brain CT equipments and 28 wholebody CT equipments. The results were summarized as follows.
1. Noise
Noise was less than 1.0 for head scan mode with brain and wholebody CT scanners. Also, 50% of wholebody scanners was beyond 1.0 for body scan mode.
2. Contrast scale
The number of CT scanners less than 2.0¡¿10^(-4) was 8(66.7%) for brain CT scanner, 9(32.1%) for head scan mode and 10(35.8%) for body scan mode with wholebody CT scanners, respectively.
3. Slice thickness
58.3% of brain CT scanners and 42.9% of wholebody CT scanners was within acceptable tolerance error ratio (¡¾10%) as for nominal slice thickness.
4. High contrast
The number of CT scanners which demonstrated a capability of resolving below 2.0mm were 8(66.6%) for head CT scanners, 28(100%) for brain scan mode and 24(85.7%) for body scan mode with wholebody CT scanners, respectively.
5. Low contrast
75% of brain CT scanners surveyed had minimum resoluble 1/8 inch diameters, And also, 96.4% of wholebody CT scanners in head scan mode and 21.4% of them in body scan mode had minimum detectable same af above diameters.
6. Artifacts
It showed that 58.4% of brain CT scanners exhibited a strong streaking artifacts while the others produced halo artifacts (25%). And also, the distribution of artifacts generated for wholebody CT scanners revealed in the order of streaking artifacts (50%) , and halo artifacts (42.9%)
7. Linearity of CT No.
Both of brain and wholebody CT scanners surveyed have not shown good linearity in CT No. measurement for various contrast materials.
8. Maximum dose
The average maximum dose for brain CT scanners was 21,57¡¾13.4mGy. And the dose for head scan mode with wholebody CT scanners was 12.5¡¾4.83mGy, the dose for body scan mode was 10.414.53m0y, respectively.
9. CTDI(Computed Tomography Dose Index)
The scanners, which was measured average CTDI below 20mGy, occupied 50% among brain CT scanners surveyed. And 85.7% of wholebody CT scanners in head scan mode and 89.3% of them in body scan mode was same as above average CTDI.
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