[Digital image intensifier radiography--what dose for what clinical problem?].
Due to a wide dynamic range it is possible to vary the dose of DIIR for each type of examination according to the required image quality. To define the possible decrease of dose compared to film-screen radiography (speed 200) the dependence of spatial resolution and contrast detectability upon dose was evaluated. We used a Polytron 1000 which was connected to a Siregraph D and an Optilux 57 (Siemens). Acquisition parameters were fixed for different types of examination and tested by imaging anthropomorphic phantoms as well as patients (n = 114). Our results demonstrate that the dose can be reduced by 60% for double-contrast examinations and by 85% for mono-contrast studies. Although DIIR is less suited for chest and skeletal imaging, a 14 cm image intensifier can be used for imaging small lesions. If poor image quality is acceptable (e. g. pelvimetry, sometimes in paediatrics), a maximum reduction of 95% is possible.
Lehmann
K J
KJ
Institut für klinische Radiologie, Klinikum Mannheim, Universität Heidelberg.
Busch
H P
HP
Georgi
M
M
D006801:Humans; D011829:Radiation Dosage; D011856:Radiographic Image Enhancement / Q000379:methods*; D013679:Technology, Radiologic
Digitale Bildverstärkerradiographie--welche Aufnahmedosis für welche klinische Fragestellung?