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What is ODI Grid?

ODI ‘s X-ray Grids incorporated the purest aluminum foil for the inter-spacer and high quality lead foil the X-ray absorber. The offers lower exposure multiplier and results in better absorption of scatter radiation. Its effect produces a general radiographic fog on the film which reduces the contrast. Our X-ray Grids are manufactured by highly trained technical experts using high precision machinery under the strictest quality control.

ODI has recently developed a brand new grid which is made of lightweight damage-resistant Polyester fiber inter-spacer for mammography x-ray systems and will provide dramatically improved contrast and more consistent image quality.

Aluminum Interspaced X-ray Grids

X-ray Grids incorporated the purest aluminium foil for the inter-spacer and high quality lead foil the X-ray absorber. The offers lower exposure multiplier and results in better absorption of scatter radiation. Its effect produces a general radiographic fog on the film which reduces the contrast. Our X-ray Grids are manufactured by highly trained technical experts using high precision machinery under the strictest quality control.

Grids come in many different combinations of ratio and lines per inch. The higher ratio of the grid(dependent on the height of the lead strips and the thickness of the inter-spacer) the better clean-up. Grid ratios of 8 : 1, 10 : 1, 12 : 1 are the most common and a range of lines from 85 to 130 lines per inch (We have a product of 150, 180 line/inch) the most frequently supplied. Parallel and focused Grids (focused to various distances) are all in our product portfolio. When ordering x-ray grids, please specify size, lines/inch, ratio, focal Distance.


Mammography X-ray Grids - Polyester interspaced-

Scattered radiation reduces subject contrast in mammography. This results in impaired detection of calcifications and outlines of tumor masses. To overcome this problem both moving and stationary grids have been developed for mammography. General purpose, moving grids cannot be utilized for mammography because of high absorption of X-ray by the inter-spaced material. Moving grids designed for mammography are thinner than convention grids and have polyester inter-spacer material. Many of the new mammography X-ray machines contain these grids mounted in a reciprocating Bucky mechanism, to make the grid lines invisible. ODI has developed a mammography grid with dower dose. General specifications of mammo grids are as below;

 
SIZE 24 X 18 cm, 30 X 24 cm
SID 48cm, 58cm, 60cm, 66cm, 76cm
RATIO 4:1, 5:1, 6:1, 8:1
LINE/INCH (cm) 40Lines/cm, 36Lines/cm, 34Lines/cm

USING MOLY TARGET TUBE WITH BERYLLIUM WINDOW



How to choose a right grid for your x-ray systems?



ODI offers a full line of aluminum interspaced x-ray grids of the highest and the most precise quality to the radiologist.

ODI’s grids contain the purest lead available to ensure superior efficiency in removing scattered radiation. Superior quality images are achieved through the use of aluminum inter-spacers and lead strips which are precisely milled to uniformity. Grid strips are sealed between a smooth aluminum cover and finished in enamel providing complete resistance to heat and moisture guaranteeing years of trouble free service. ODI grids are available in :


Selecting The Right Grid
Cleanup Type of Grid Positioning     attitude Recommended To Remarks
Superlative 8:1 ratio criss-cross Distance-fair: centering & leveling slight 120kvp Not recommended for tilted tube techniques.
Superlative 15:1 ratio linear Very slight Over 100kvp Extra care required for proper alignment. Usually used in fixed mount.
Excellent 6:1 ratio criss-cross Good 110kvp Not suitable for tilted tube techniques.
Excellent 12:1 ratio linear Very slight 110kvp also for higher kvp's Extra care required for proper alignment. Usually used in fixed mount.
Very Good 5:1 ratio criss-cross Extreme 110kvp Tube tilt limited 5?
Very Good 10:1 ratio linear Slight 100kvp Reasonable care required for proper alignment.
Good 8:1 ratio linear Distance-fair: centering & leveling slight 100kvp For general stationary grid use.
Moderate 6:1 ratio linear Good 80kvp Least expensive of stationary grids.
Moderate 5:1 ratio Extreme 80kvp Very easy to use.
Listed in descending order of cleanup effectiveness



Selection Basis of Cleanup Requirements
Cleanup Type of Grid Positioning Recommended To
Excellent 12:1 ratio Very slight 110 Kvp or more higher Kvp
Very good 10:1 ratio Slight 100 Kvp
good 8:1 ratio Slight 100 Kvp
Moderate 6:1 ratio Good 80 Kvp
Moderate 5:1 ratio Extreme 80 Kvp
 
Bucky Factor Guide

These graphs show Bucky factors average from result of test with various phantoms. Bucky factor vary depending on regions radiographed so use these graphs only as a guide

When ordering Super-line grids, please specify size, ratio, focal distance and density (number of lines). For special sizes, your order must also state "Overall Dimensions" Lead strips will always be parallel to the long dimension unless otherwise ordered.



What is the specification of ODI Grids ?



Grid Composition Part Density Inter-spacer X-Ray absorbing part
80-85 Line/Inch 0.25m/m AL-Foil 0.05 m/m Lead-Foil
100-103 Line/Inch 0.20m/m AL-Foil 0.05 m/m Lead-Foil
120 Line/Inch 0.15m/m AL-Foil 0.05 m/m Lead-Foil
150 Line/Inch 0.12m/m AL-Foil 0.05 m/m Lead-Foil
Marking Center Line, Ratio, Focal Distance, Size, Tube-side, Serial number, etc.
Thickness of 80-85 Line/Inch 5 : 1 6 : 1 8 : 1 10 : 1 12 : 1 14 : 1
1.65m/m 1.90m/m 2.40m/m 2.90m/m 3.40m/m 3.90m/m
Thickness of 100-103 Line/Inch   6 : 1 8 : 1 10 : 1 12 : 1 14 : 1
  1.60m/m 2.00m/m 2.40m/m 2.80m/m 3.20m/m
Thickness of 120 Line/Inch   6 : 1 8 : 1 10 : 1 12 : 1 14 : 1
  1.30m/m 1.60m/m 1.90m/m 2.20m/m 2.50m/m
Thickness of 150 Line/Inch   6 : 1 8 : 1 10 : 1 12 : 1 14 : 1
  1.12m/m 1.36m/m 1.60m/m 1.84m/m 2.08m/m


Focal Distances


Ratio Type Focal Distance
5 : 1 Focused 28"~48", 49"~72"
5 : 1 Parallel 48" to infinity
6 : 1 Focused 28"~48", 49"~72"
6 : 1 Parallel 48" to infinity
8 : 1 Focused 26"~32", 34"~44", 48"~72"
10 : 1 Focused 34"~33", 48"~72"
12 : 1 Focused 34"~44", 40"~72", 48"~72"

Standard sizes


By inch By cm
Film size Grid size
8 X 10 9 X 11 18 X 24
10 X 12 11 X 13 24 X 30
11 X 14 12 X 15 30 x 40
14 X 14 15 X 15 35 X 35
14 X 17 15 X 18 35 X 43
17 X 17 17 1/4 X 17 3/4 43 X 43
18 X 18 17 1/4 X 18 7/8 44 X 48
14 X 36 15 X 37 30 X 90


Any sizes are available upon request.