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Narrating and imaging an aortic dissection

Robert Kaiser, a distinguished reporter and editor at the Washington Post, describes his aortic dissection here.

To see the spiral CT scan animation and still-land drawings of the operation, go to the Interactive Graphic box, "My Telltale Heart." Watch the animation several times, after studying the last frame, to see the dynamics of the dissection. Or, for the images, read the article.

To read the entire article without having to go through all 5 page links, just go to "print this article" which puts all the pages onto one continuous page (and does not cause your computer to print the article).

Now and then, this personal narrative leaves the case-study (n = 1) mode and provides some general context. For example: "Unless repaired, dissections of the ascending aorta kill most of the people who have them, instantly or eventually. The risk of death for those who survive the dissection itself rises sharply as time passes -- about 1 percent per hour for 48 hours." The report also illustrates the great importance of good imaging, which is usually non-invasive, in preparation for the often-invasive treatment. And also the statistical lesson in medical care: always ask how many times the surgeon has done the proposed procedure (in this case 200 times), since, as in so many things, rehearsal improves performance.

By tracing out in detail the months-long events, Kaiser's report is helpful to those facing such difficulties. It also illustrates what optimal care looks like, thereby providing a basis for comparison for less privileged patients.

Finally, in case studies, the question is always "Compared to what?" Robert Kaiser fortunately survived to write this riveting account. If not, no story.


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Art History Without Slides

Digital images offer professors flexibility in teaching, but creating collections is difficult

By Brock Read

Northampton, Mass.

Dana Leibsohn, an assistant professor of art at Smith College, is talking about Nazcan pottery in her survey course on pre-Columbian art. The rough surfaces of the vessels, she explains, reflect the rock-strewn deserts of the makers' Peruvian homeland.

She projects an image of a pot on the classroom's front wall. But instead of leaning toward the image and squinting to make out details of its texture, the students wait for the professor to zoom in, revealing the pot's irregularities.

The course is one of several at Smith that have done away with slides and traditional projectors in favor of an expensive but promising alternative: images stored on the college's computer network and digitally projected into lecture rooms. With the new technology, Ms. Leibsohn can zoom in on images, juxtapose them, and call up information about them, all through a computer and touch-sensitive screen built into her lectern.

The college's art department is putting digital imaging at the core of its teaching. Six of Smith's 16 art-history professors use the computerized slides, both in lectures and on course Web sites. The technology, professors say, has great promise. Lectures and class discussions can be made more flexible and free-form. And because images on the department's network are available anytime and from any computer, many professors find that students spend less time looking for images and more time looking at them.

Imaging technology might also bring what John Davis, chairman of Smith's art department, calls a culture change to his field. Professors at Smith envision taking a sharp turn away from the stereotype of art-history programs as fusty and isolated. They anticipate moving toward an interdisciplinary model, focusing on interdepartmental collaboration and open access.

Smith, however, is one of very few colleges aggressively incorporating digital images into its art-history program. Most institutions are moving in that direction only slowly, if at all. In large part, that is because building a digital-image collection is an expensive, time-consuming process, at least for now. Art libraries with small budgets find it difficult to justify extensive digitization while they still have traditional slides to acquire and maintain.

Some of the costs of digitization may eventually drop. At present, every institution building a digital collection creates its own catalog information for each slide -- a time-consuming process that could be skipped if large databases were available to many institutions. But colleges and museums have found their efforts to share images stalled by the fair-use provisions of copyright law, under which institutions can freely re-use the images only within their own walls. For digital imaging's impact to extend beyond small liberal-arts colleges, it must become more affordable and efficient, experts in the field agree.

A Teaching Tool

In 1999, administrators at Smith decided to make digital technology the centerpiece of a $30-million renovation of the Brown Fine Arts Center, which includes an art museum, art library, slide collection, and classrooms for both art-history and studio students.

So far, the college has created about 8,000 digital images, each scanned at high resolution from the art-history department's collection of slides and mounted photographs, as well as from museum holdings and textbooks. The images reside in a database on a pair of servers maintained by technologists working in the arts center.

Professors who use the computerized slides assemble reserves of digital images using relevant slides from the database. For lectures, they can create smaller folders from which they can quickly call up images. Because the database is searchable, professors and students can display any image at any time -- a feature that Ms. Leibsohn says is invaluable in promoting flexible discussions.

In class, she manipulates the images with a touch screen -- which directs a digital projector hanging from the ceiling -- and with her own laptop, on which she saves course notes and lists of images. Because the college has also put many of its art-history texts and resources online, she and her students can conduct most out-of-class research at their own computers.

Smith's commitment to digital imaging as a teaching tool is rare. Slide librarians at Yale have digitized about 15,000 documents, but those images are used primarily as online study tools for students, not as staples of the lecture hall. Other institutions, including Vassar College, are using imaging projects primarily to make their museums' collections more visible.

Professors and image archivists on the campuses where large-scale digitization efforts are under way argue that digital images are of sufficient quality to replace slides, thanks to high-resolution scanning-and-projection technology. "When I first saw the digital projections, I was very impressed. The images are just juicy on the screen," says Smith's Mr. Davis.

Imaging technology also allows students and professors to manipulate digital slides quickly. When Ms. Leibsohn zooms in on a pre-Columbian pot in class, a more detailed image loads in only a few seconds. She attributes the speed to the art department's sizable servers, along with software that zooms in on the selected portion without rendering the rest of the image.

James Mundy, a lecturer in art history at Vassar who is director of the college's Frances Lehman Loeb Art Center, says digital imaging does for art historians what microscopy does for research scientists: It offers more control and more detail in examinations. "With digital details, you're seeing things that your mind does not choose to notice," he says.

The real key to digital images, says Susan Williams, curator of visual resources at Yale, is that they are always available to students, on the campus and off. "Students much prefer studying in dorm rooms to coming over and looking at slides or displays." There's a downside to such availability, she adds: Students spend less time at the image library's walls of mounted photographs of artworks. Those displays -- Yale's primitive equivalent of putting images on reserve -- have often sparked impromptu discussions and study sessions.

Smith's slide library, too, reports less student traffic since it made digital reserves available. That's not necessarily a bad thing, says Ms. Leibsohn. She argues that when students survey images from their own desks, they spend more time actually examining the artworks. "Students become better image readers," in papers and in class, she says. "They become adept at using visual evidence to support their claims."

Professors have been slower than students to embrace digital imaging. Few faculty members at Yale trust the underlying technology enough to build courses around it. Some find learning a new technology an uncomfortable and unnecessary process; others worry that the computer network will collapse, leaving them unprepared for lectures. "I feel it's quite reliable, but it's going to take a culture change," says Ms. Williams. "As graduate students become more adept and confident, they will pass that along to the faculty."

Finessing Fair-Use

Neither Smith nor Yale wants to rush professors into using the technology. For one thing, librarians at Smith estimate that they have the time and resources to digitize images for no more than several classes a year.

But professors who shy away from digital images still plan their lectures and conduct research with traditional slides. Maintaining those collections while expanding digital ones is a tall order for libraries on tight budgets.

Digital collections are expensive to start -- high-resolution scanning requires high-end equipment. And institutional studies have found that the collections are costly to expand as well. Mr. Mundy says Vassar spends $9,000 a month for work on its archive.

Smith's digital collection has been paid for, in part, by an initial grant of $300,000 from the Andrew W. Mellon Foundation. Yale and Vassar jump-started their archives with grant money, too. But as image digitization becomes less novel, grant money may dry up, leaving colleges to make difficult budgetary decisions.

Yale's slide library has already stopped photographing artworks from textbooks to display on the image library's walls, except when specifically requested by professors. That's one of several sacrifices made to free librarians for cataloging, a process that represents the bulk of the work in building digital collections.

Scanning items actually takes little time, but cataloging them is another matter. To make the digital images useful and searchable, colleges must enter information about the artworks represented, the artists who created them, and the culture and date from which they come, among other data. "It's caused stress, and we've had to increase our staff," says Ms. Williams.

Ms. Williams and Elisa Lanzi, director of Smith's image collections, say the solution is simple: Colleges need to develop a national framework for sharing catalog records. Many institutions digitize identical documents, but each enters its own records, duplicating labor and creating potentially contradictory catalog data.

Slide librarians hope that an effort started by the Visual Resource Association, a nonprofit consortium of image-management professionals, will offer them a set of standardized records. Ms. Lanzi, the group's president, says such a database would allow slide librarians to use "copy cataloging," much as the Online Computer Library Center has done for campus librarians who create catalogs of books.

Even then, many institutions may not want to undertake the process of building a digital-image collection on their own. "The future will be about subscribing to various products rather than the in-house works," says Ms. Williams.

Yale and Smith bolster their traditional slide holdings by paying vendors for general collections. They also license the rights to digital archives through vendors. The largest such licenser, the Art Museum Image Consortium, includes more than 100,000 images, culled from public, private, and institutional museums worldwide. But even Amico, as the consortium is known, is only "a piece of the encyclopedia," says Ms. Lanzi. And it offers little hope for image-sharing between institutions because they must pay an enrollment-based fee either to receive images or to submit them to the database.

Smith and Yale have been unable to share digital images through other venues because of fair-use laws, under which colleges are allowed to use, at no cost, images of artworks that they cannot acquire at a reasonable price. But the institutions are prohibited from using the images outside of their own walls because rights to the images themselves belong to museums and, sometimes, individual photographers.

As a result, Smith cannot share its digital collection even with neighboring members of its five-college consortium. "You're always up against this copyright issue," Ms. Lanzi says. "Many institutions are scanning the same images over and over -- and it's a very expensive duplication of effort."

A possible solution, she says, is ArtSTOR, a nonprofit project begun last year by the Mellon foundation, which aims to create a legal haven for digital images. The organization is digitizing 225,000 images from the slide collection of the University of California at San Diego and preparing to test the enforcement of fair-use policies.

Until colleges and museums can finesse fair-use restrictions, Ms. Lanzi says, the future of art-history pedagogy may be hamstrung. "How many times do we have to scan the 'Mona Lisa'?" she asks. "Once, hopefully."

4 LEADING DIGITAL COLLECTIONS

Building a digital-image collection can be time-consuming and expensive, but several colleges and arts organizations have deemed it worth the cost. Following are some of the leading digital-imaging projects:

Smith College
Size: About 8,500 images
Sources: Slides, photographs, textbooks, and museum holdings
Financing: Grant from the Andrew W. Mellon Foundation

Vassar College
Size: About 5,000 images are being scanned and prepared for use.
Sources: Museum holdings
Financing: Independent grants

Yale University
Size: About 21,000 images
Sources: Slides, photographs, textbooks, and museum holdings
Financing: Library and university funds

Art Museum Image Consortium
Role: The consortium sells licenses for the use of digital images from its archives to colleges and arts organizations.
Size: More than 100,000 images
Sources: An international selection of public, private, and institutional museums

Section: Information Technology Volume 49, Issue 20, Page A29

Sparklines (original version)

MAY 29, 2004:    MORE RECENT VERSION OF SPARKLINE CHAPTER POSTED ON THIS NEW THREAD

Measuring resolution

What impact does resolution have on file size?

John Prine

Mr. Tufte,

I'm new to your ideas and concepts about visual design and have just finished reading "The Cognitive Style of PowerPoint." Not to diminish the strength and validity of your work presented, I was most impressed with your John Prine quote.

I am always amazed at the people who love John Prine. I am a very big fan of John Prine. John could write of me, "And if I wrote a song, She'd know ever single word." My most recent concert was October 24, 2003 in Evansville, In., with many of his family members in the audience. I'm already preparing for a show this year, just need to pick a city.

My questions are:

Do you attend any of the live shows? Who's getting regular play on your CD at this moment? Any John Prine?

Table Graphics

Table Graphics have been used in a couple of threads and in your books. Would you care to elaborate on this technique?

I'm interested in the following:

1. data density

2. best scenarios for using table-graphics

3. issues with scale

4. small multiples of table graphics (ala Dave Nash's post)

5. Using table graphics for confections?

Thanks,

Sean

Software for typesetting a book

What software do you use to prepare your beautiful books? What's your view of LaTeX, based on Dr. Knuth's TeX?

Typefaces for official correspondence

What font do you recommend for official correspondence? I would like to try and convince my work (a State government agency) to switch from Arial (10, 12 and 14 pt, with fully-justified paragraphs!) to the most reader-friendly font/layout possible.

I know from reading your books that serifs make reading much less of a chore, as do left-justified paragraphs, but I'm not sure which font would be the best. I have personally made the switch to Times New Roman 12pt for my writing at work but of course nearly everyone else is toeing the line and using Arial.

I note that the US State Department has recently switched from Courier 12pt to Times New Roman 14pt, refer link for news report, so maybe Times New Roman is the way to go?

Railroad Atlas of 1946

Has anyone seen the newly published (by the JHU Press) Railroad Atlas of the United States in 1946 (first volume) by Richard Carpenter?

I read the Fast Company article (in their Feb04 issue and to be available online soon)--

Making Tracks

Richard Carpenter is mapping every mile of America's railroad system as of 1946. By hand. "It's a story," he says, "that needs to be told." By Charles Fishman

It looks very interesting. It appears that Mr. Carpenter did the work from other works (i.e., he did not travel the lines) and moderated the differences between those primary works.

I saw one reader review that cited two possible complaints--no distinction in the drawings of the "importance" of the lines, that is how many lines a railroad operator had between points A and B; and no regional overview to connect the maps together.

I would be interested in a forum discussion of the book, its techniques, and the article (such as the contained quote from John C. Hudson, Northwestern U. professor of geography, that "Carpenter has invented his own style of cartography.")

NORM

Editor

The Common Sense Investor newsletter

Mapping election results

Just wanted to mention a set of redrawn maps of the county-by-county Iowa caucus results, from a former student of E.T.: http://www.style.org/iowacaucus/.

Iowa was interesting to work on because the state is divided into an almost even grid of counties.