Lagerburg V, Moerland M A, Konings M K, van de Vosse R E, Lagendijk J J W, Battermann J J
Department of Radiotherapy, University Medical Center Utrecht, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands.
Phys Med Biol. 2006 Feb 21;51(4):891-902. doi: 10.1088/0031-9155/51/4/009. Epub 2006 Jan 25.
The purpose of this study is to develop and test a tapping device for needle insertion for prostate brachytherapy. This device will tap the needle into the prostate with a certain, well-defined, amount of momentum, instead of the currently used method of pushing the needle. Because of the high needle insertion velocity, we expect prostate motion and deformation to be less compared to current methods. We measured the momentum that is applied when manually tapping the needle into the prostate and found a mean momentum of 0.50 +/- 0.07 N s. The tapping device is pneumatically driven and we found that the delivered momentum increased linearly with the applied air pressure. The efficacy of the tapping device was tested on a piece of beef, placed on a freely moving and rotating platform. A significant correlation was found between the applied pressure and the rotation and displacement of the beef. Displacements and rotations were minimal for the highest pressure (4 bar) and amounted to only 2 mm and 6 degrees, respectively. Higher air pressures will further reduce displacements and rotations.
本研究的目的是开发并测试一种用于前列腺近距离放射治疗的针插入敲击装置。该装置将以一定的、明确的动量将针敲入前列腺，而不是采用目前使用的推针方法。由于针的插入速度较高，我们预计与当前方法相比，前列腺的运动和变形会更小。我们测量了手动将针敲入前列腺时施加的动量，发现平均动量为0.50±0.07 N·s。敲击装置由气动驱动，我们发现输送的动量随施加的气压呈线性增加。敲击装置的功效在一块放置在自由移动和旋转平台上的牛肉上进行了测试。发现施加的压力与牛肉的旋转和位移之间存在显著相关性。在最高压力（4巴）下位移和旋转最小，分别仅为2毫米和6度。更高的气压将进一步减少位移和旋转。
