Author/Authors :
Enomoto، نويسنده , , Toshiyuki and Sato، نويسنده , , Eiichi and Abderyim، نويسنده , , Purkhet and Abudurexiti، نويسنده , , Abulajiang and Hagiwara، نويسنده , , Osahiko and Matsukiyo، نويسنده , , Hiroshi and Osawa، نويسنده , , Akihiro and Watanabe، نويسنده , , Manabu and Nagao، نويسنده , , Jiro and Sato، نويسنده , , Shigehiro and Ogawa، نويسنده , , Akira and Onagawa، نويسنده , , Jun، نويسنده ,
Abstract :
X-ray fluorescence (XRF) analysis is useful for mapping various molecules in objects. Bremsstrahlung X-rays are selected using a 3.0-mm-thick aluminum filter, and these rays are absorbed by iodine, cerium, and gadolinium molecules in objects. Next, XRF is produced from the objects, and photons are detected by a cadmium-telluride detector. The Kα photons are discriminated using a multichannel analyzer, and the number of photons is counted by a counter card. The objects are moved and scanned by an x–y stage in conjunction with a two-stage controller, and X-ray images obtained by molecular mapping are shown on a personal computer monitor. The scan steps of x and y axes were both 2.5 mm, and the photon-counting time per mapping point was 0.5 s. We carried out molecular mapping using the X-ray camera, and Kα photons from cerium and gadolinium molecules were produced from cancerous regions in nude mice.
Keywords :
X-ray fluorescence analysis , Energy discrimination , Cadmium-telluride detector , Cerium mapping , Iodine mapping , Gadolinium mapping , cancer diagnosis
