RT Book, Section
A1 Chen, Michael Y. M.
A1 Whitlow, Christopher T.
A2 Chen, Michael Y.M.
A2 Pope, Thomas L.
A2 Ott, David J.
SR Print(0)
ID 6668001
T1 Chapter 1. Scope of Diagnostic Imaging
T2 Basic Radiology, 2e
YR 2011
FD 2011
PB The McGraw-Hill Companies
PP New York, NY
SN 978-0-07-162708-5
LK accessmedicine.mhmedical.com/content.aspx?aid=6668001
RD 2024/04/25
AB For  almost  half  a  century  following  the  discovery  of  x-rays  by  Roentgen  in  1895,  radiologic  imaging  was  mainly  based  on  plain  and  contrast-enhanced  radiography.  Those  images  were  created  by  exposing  film  to  an  x-ray  beam  attenuated  after  penetrating  the  body.  The  production  of  x-rays  and  radiographic  images  is  described  in  the  next  chapter.  In  the  recent  half  century,  diagnostic  radiology  has  undergone  dramatic  changes  and  developments.  Conventional  angiography,  nuclear  medicine,  ultrasonography,  and  computed  tomography  (CT)  were  developed  between  1950  and  1970.  Magnetic  resonance  (MR)  imaging,  interventional  radiology,  and  positron  emission  tomography  (PET)  were  developed  later.  Conventional  radiology,  including  contrast-enhanced  radiography  and  CT,  uses  ionizing  radiation  created  from  x-ray  equipment.  Nuclear  medicine  uses  ionizing  radiation  that  is  emitted  from  injected  or  ingested  radioactive  pharmaceuticals  in  various  parts  of  the  body.  Ultrasonography  and  MR  imaging  modalities  use  sound  waves  and  magnetism,  respectively,  rather  than  ionizing  radiation.