The purpose of this study was to investigate the feasibility of a simple deformable phantom as a QA<影像品質保證> tool for testing and validation of deformable image registration algorithms. A diagnostic thoracic imaging phantom with a deformable foam insert was used in this study. Small plastic markers were distributed
through the foam to create a lattice with a measurable deformation as the ground truth data for all comparisons. The foam was compressed in the superior-inferior direction using a one-dimensional drive stage pushing a flat “diaphragm”to create deformations similar to those from inhale and exhale states. Images were acquired at different compressions of the foam and the location of every marker was manually identified on each image volume to establish a known deformation field with a known accuracy. The markers were removed digitally from corresponding images prior to registration. Different image registration algorithms were tested using this method. Repeat measurement of marker positions showed an accuracy of better than 1mm in identification of the reference marks. Testing the method on several image registration algorithms showed that the system is capable of evaluating errors quantitatively. This phantom is able to quantitatively assess the accuracy of deformable image registration, using a measure of accuracy that is independent of the signals that drive the deformation parameters. 2007 American Association of Physicists in Medicine.
- 1 decade ago
這項研究的目的將調查一個簡單的可變型 幽靈的可行性作為為可變形圖像註冊算法的測試和檢驗的一個QA 工具。一個診斷胸部想像幽靈與可變形 泡沫插入物被使用了在這項研究。小塑料標誌被分佈通過泡沫創造格子以可測量的變形作為地面真相資料為所有比較。泡沫被壓縮了在優越下等方向使用一個一維驅動階段推擠一平的"隔膜"往 創造變形相似與那些從吸入和呼氣狀態。圖像被獲取了在泡沫的不同的壓縮並且每個標誌的地點手工被辨認在各圖像容量建立一個知道的變形領域以已知的準確性。標誌從對應的圖像數字式地被去除了在註冊之前。不同的圖像註冊算法被測試了運用這個方法。標誌位置的重覆測量顯示了準確性更好比1mm 在參考標記的證明。試驗方法在幾種圖像註冊算法證明, 系統是能定量地評估錯誤。這個幽靈能定量地估計可變形 圖像註冊準確性, 使用是獨立信號駕駛變形參量準確性的措施。物理學家的2007 個美國人協會在醫學。