Lec 1 History

Question 1

– German glass blower.
– Built the first vacuum tube.

Answer 1

Johann Heinrich Wilhelm Geissler

Question 2

What is the first vacuum tube called as?

Answer 2

Geissler tube

Question 3

– German physicist.
– Used the vacuum tube to study
fluorescence.

Answer 3

Johann Wilhelm Hittorf

Question 4

In 1870, he observed that the discharges emitted from the negative electrode of the tube traveled in straight lines, produced heat and resulted in greenish fluorescence (Cathode Rays).

Answer 4

Johann Wilhelm Hittorf

Question 5

English Chemist; redesigned the vacuum tube: “Crookes Tube.”

Answer 5

William Crookes

Question 6

Discovered that the cathode rays were
streams of charged particles

Answer 6

William Crookes

Question 7

Discovered that cathode rays could penetrate a thin window of aluminum foil built into the walls of the glass tubes and cause fluorescent screens to glow.

Answer 7

Philip Eduard Anton von Lenard

Question 8

Made the first dental radiograph in 1896.

Answer 8

Otto Walkhoff

Question 9

Made the first dental radiograph in the US using a skull.

Answer 9

W.J. Morton

Question 10

Exposed the first dental radiograph in the US using a live patient.

Answer 10

Carl Edmund Kells (C.E. Kells)

Question 11

Developed the first dental x-ray unit.

Answer 11

William Herbert Rollins (WH Rollins)

Question 12

Published the first paper on the dangers associated with radiation.

Answer 12

William Herbert Rollins (WH Rollins)

Question 13

First to use film in intraoral radiography

Answer 13

Frank Van Woert

Question 14

Established the first college course in radiography for dental students.

Answer 14

Howard Riley Raper (HR Raper)

Question 15

• Discovered the x-ray on November 8, 1895
• “Father of x-rays”
• Used the Crookes vacuum tube
• While working in a darkened laboratory with a vacuum tube, he noticed a faint green glow coming from a nearby table.
• He concluded that unknown rays caused the fluorescence- x-rays

Answer 15

Wilhelm Conrad Roentgen

Question 16

Old term for taking radiographs → “shadow writing”

Answer 16

Skiograms / Skiagraphs

Question 17

Electrical engineer who developed the first high powered cathode x-ray tube in 1913.

Answer 17

William D. Coolidge

Question 18

His x-ray tube became the prototype for all modern x-ray tubes.

Answer 18

William D. Coolidge

Question 19

Manufactured a miniature version of the x-ray tube placed inside the head of an x-ray machine and immersed in oil.

Answer 19

Victor X-ray Corporation of Chicago

Question 20

Introduced an x-ray machine with improved features in 1933. (First variable-kiloVoltage x-ray machine).

Answer 20

General Electric

Question 21

Dental x-ray packets consisted of glass photographic plates or film cut into small pieces and hand-wrapped in black paper and rubber.

Answer 21

Otto Walkhoff

Question 22

Manufactured the first prewrapped intraoral films in 1913.

Answer 22

Eastman Kodak Company

Question 23

Introduced Digital Radiography System (DRS) to the dental market in France in 1987.

Answer 23

Dr. Francis Muoyen

Question 24

Introduced the bisecting technique in 1904.

Answer 24

Weston Price

Question 25

Redefined the bisecting technique.

Answer 25

Howard Riley Raper

Question 26

Introduced the bitewing technique in 1925.

Answer 26

Howard Riley Raper`

Question 27

Authored one of the first dental radiography textbooks in 1913.

Answer 27

Howard Riley Raper

Question 28

Introduced the paralleling technique in 1896.

Answer 28

Carl Edmund Kells

Question 29

Father of Modern Dental Radiography

Answer 29

F. Gordon Fitzgerald

Question 30

Introduced the long-cone paralleling technique in 1947.

Answer 30

F. Gordon Fitzgerald

Question 31

• First to expose a panoramic radiograph in 1933.
• Intraoral

Answer 31

Hisatugu Numata

Question 32

• Father of Panoramic Radiography
• Extraoral

Answer 32

Yrjo Paatero