principle: fluoroscopy -...
Transcript of principle: fluoroscopy -...
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projection-radiography
principle: fluoroscopy
Streustrahlenraster
Röntgen-
röhre
Filter Strahlenblende
objektnahe
Blende
Bildwandler-
systemBetrachter
DADE
E B
E: Eintrittsebene
B: Betrachtungsebene
DE: Ebene der Objekt-Einfallsdosis
D : Ebene der Objekt-Austrittsdosis
x-ray tube
filter radiation diaphragm
aperture(near object)
raster (scattering radiation)
observer
imageconversionsystem
E: entry planeB: observation plane
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projection-radiography
source:
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projection-radiography
x-ray investigation room (around 1900)x-ray investigation room (around 2000)
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projection x-ray system for film / amplifier foils
source: Siemens Medical
projection-radiography
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x-ray image amplifier system
source: Siemens Medical
projection-radiography
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J0 µ(x,y,z)
µ=f(e--density, Z3)
JD
x-ray source patient detector∫−= )dlµ(
0D x,y,z
eJJ
line integral of attenuation
attenuation: absorption (photo effect) and scattering (inelastic)
radiographic image:
- distribution of γ-quanta transmitted through tissue- 2D-projection of attenuation properties of tissue
principle of measurement
projection-radiography
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attenuation
lin. attenuation coeff. = mass attenuation coeff. . density
µ = µm. ρ
tissue Zeff density (g/cm3)
bones 11.6 1.75fat 6.3 0.92muscle 7.4 1.00
image contrast: different Zeff for bones and soft tissue
but: no clear-cut distinction between different soft tissues
projection-radiography
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attenuation coefficients of biologic tissues @60 keV
tissue attenuation coefficient (cm-1)
blood 0.215
brain tissue 0.210
water 0.203
fat 0.185
bones 0.400
air 0.0002
hard todistinguish
easy todistinguish
projection-radiography
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attenuation coefficient and film blackening
x-rays
air fat water bones metal
µ
projection-radiography
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chest radiograph
projection-radiography
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higher absorption by bones
due to calcium
bone fracture
projection-radiography
hand radiograph
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projection-radiography
skull radiograph
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skull fracture
projection-radiography
skull radiograph
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lumbar/cervical spine radiograph
projection-radiography
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control of implants and splints
projection-radiography
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mammography
projection-radiography
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contrast agents- visualization of vessels- contrast agents have higher atomic number than biologic environment
x-ray image of gastro-intestinal systemafter intake of a BaSO4-pulp
x-rayangiographyof blood vessels
projection-radiography
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contrast agents
projection-radiography
jointsx-ray negativecontrast agents
x-ray negativecontrast agents
vessels
gastro-intestinal system
air, CO2, N2O
triiodobenzoic acid (TIBA)and other
BaSO4
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contrast agents visualization of vessels
areas of application (iodide- and barium-containing CA):
urogram: kidneys, urinary tracts
galactography: mammary ducts
myelography: spinal cord
cholezystol angiogram: biliary tracts
sialography: salivary gland
arthrography: joints
ERCP: biliary tracts, pancreas
phlebography: veins
lymphography: lymphatic gland and tracts
barium swallow: pharynx, esophagus, small bowel,
colon, stomach
projection-radiography
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contrast agents digital subtraction angiography (DSA)
visualization of vessels without disturbing impact of bones:
- injection of contrast agent (via artery)
- x-ray imaging before and after contrast agent reachedorgan/area of interest
- “subtraction” of images (computer)
Caveats:- subtraction of logarithmized images leads to clear image of vessel !!(otherwise artifacts, e.g. due to bones)
- movement artifacts !!!
projection-radiography
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without CA:
with CA:
log. difference image:grey level dependson thickness ofvessel only !!
projection-radiography
contrast agents digital subtraction angiography (DSA)
where JM = outgoing intensity (without CA) (M = mask); J0= ingoing intensity;
= mean attenuation coefficient; D = thickness of object
−
µ
⋅= eJJµD
M 0
where JF = outgoing intensity (with CA) (F = filling); G = thickness of vessel;
( )[ ]⋅= ⋅+−−eJJ
GGD
FJµµ
0
= mean attenuation coefficient of CA (J = iodide)µJ
)()(
ln)(lnlnln 00
µµµµµµµµ
>>−≈−=+−−−−=−
JJJ
JMF
GG
DJGGDJJJ
:if
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projection-radiography
contrast agents digital subtraction angiography (DSA)
injection mask filling
CA concentration
time
mask filling subtraction
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projection-radiography
contrast agents digital subtraction angiography (DSA)
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projection-radiography
contrast agents digital subtraction angiography (DSA)
DSA of a. mesenterica(branch of abdominal aorta)
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projection-radiography
contrast agents digital subtraction angiography (DSA)
DSA of hand
DSA of lung
DSA of pelvis
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DSA with EKG-triggering (e.g.: splenic vessels)
projection-radiography
contrast agents digital subtraction angiography (DSA)
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brain cerebral angiography, cranial vessels, carotid
bones/joints fracture, osteoporosis, spinal disc, bone tumor,prosthetics, joint cavity (arthography)
blood vessels/heart angiography (heart, coronary vessels, brain,
limbs, kidneys, aortic valve, aortic arch,veins, ventricles of heart
gastro-intestinal tract appendix, constipation, bowel occlusion,twisting of the bowels
kidney/bladder splenic vessels, lithotripsy (e.g. renal stones)
breast mammography (precaution, cancer)
lung embolism, inflammation, tuberculosis
teeth dental root, jaw
projection-radiography
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summary:
pros:
easy-to-handle, cheap ⇒ broad applicability
cons: ionizing radiation, radiation protection
images not invariant under rotation of object
different soft tissues hard to distinguish
no 3D-information(overlay of back-to-back objects)
projection-radiography