Published ahead of print on August 21, 2008
doi: 10.3174/ajnr.A1235
Dose Measurement on Both Patients and Operators during Neurointerventional Procedures Using Photoluminescence Glass Dosimeters
T. Moritakea,
Y. Matsumarub,
T. Takigawab,
K. Nishizawac,
A. Matsumurad and
K. Tsuboie
a RadGenomics Research Group, Research Center for Charged Particle Therapy, National Institute of Radiological Sciences, Chiba, Japan
b Department of Endovascular Neurosurgery, Toranomon Hospital, Tokyo, Japan
c Radiological Protection Section, Research Center for Charged Particle Therapy, National Institute of Radiological Sciences, Chiba, Japan
d Department of Neurological Surgery, Doctoral Programs in Functional and Regulatory Medical Sciences, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Ibaraki, Japan
e Proton Medical Research Center, University of Tsukuba, Ibaraki, Japan
View larger version (158K):
[in this window]
[in a new window]
|
Fig 1. The small PLD chips used in this study are 12 mm in length and 1.5 mm in diameter. A small square in the background represents 1 mm2.
| |
View larger version (24K):
[in this window]
[in a new window]
|
Fig 2. Dose-monitoring points for patients. The number in each circle represents the position number for the PLD placement.
| |
View larger version (22K):
[in this window]
[in a new window]
|
Fig 3. Geometric distribution of operators’ average ESDs per procedure. ESDs on No. 3 (thyroid) and Nos. 6–10 are measured inside of the lead protector. The number in each circle represents the position number for PLD placement.
| |
View larger version (8K):
[in this window]
[in a new window]
|
Fig 4. A, The relative response of PLD to x-rays with different effective energy compared with an ionization chamber. PLD chips are irradiated on the tissue-equivalent phantom8 with (open circle) and without (black circle) a filter for energy compensation. B, Calibration factor converting the PLD readout value to the ESD as a function of the effective energy. All the PLD chips are irradiated without a filter for energy compensation.
| |
View larger version (27K):
[in this window]
[in a new window]
|
Fig 5. A, The relative (percentage) dose distribution to the maximum ESD for each patient. Each number represents a corresponding patient number listed in on-line Table. B, Geometric distribution of the average ESDs per procedure of 28 interventional radiology patients. The number in each circle represents the position number for PLD placement.
| |
View larger version (29K):
[in this window]
[in a new window]
|
Fig 6. Correlations between the maximum ESD and angiographic parameters. Circle indicates a neurointerventional procedure without skin injury; x, patient No. 1 in on-line Table exhibited a depilation; triangle, patient No. 9 in on-line Table exhibited a depilation. A, Correlation between maximum ESD and total exposure time (r = 0.5283, P = .005, n = 27). B, Correlation between maximum ESD and dose-area product (r = 0.7917, P < .001, n = 21). C, Correlation between maximum ESD and total number of DSA studies (r = 0.5636, P = .002, n = 27). D, Correlation between maximum ESD and total number of DSA frames (r = 0.8583, P < .001, n = 23). Lines on the graphs indicate linear regressions.
| |
View larger version (23K):
[in this window]
[in a new window]
|
Fig 7. A 49-year-old man presents with radiation-induced depilation and erythema after a neurointerventional procedure. A, Square depilation in the right temporal area. B, Distribution of ESDs of this patient. The number in each circle represents the position number for PLD placement.
| |
